New WordPress Plugin: Footnotes

This beast has been upgraded for WordPress 2.0.x.

Yesterday while working on a draft of a future post I decided footnotes would be useful. After recently setting up a wiki[1] I very much like how DokuWiki handles footnotes[2].

So I figured I’d knock together a quick plugin for WordPress to handle footnotes in a similar way. One drawback I found to the DokuWiki method is that you can’t refer to the same footnote in more than one place, so I made it so you could.[3]

After finishing the coding late last night, I decided that given how simple it turned out to be there were probably other footnote plugins out there, and I wasn’t wrong.

It turns out there is already a DokuWiki mark-up parser for WordPress, in the plugin repository [4] which (I would assume) includes the footnotes functionality.

There are other more full-service mark-up plugins which provide footnote functionality as well such as Textile 2.0 [5].

There are also footnote Plugins out there for WordPress done by MovableTripe and Alex King [6].

Anyway, I’m releasing my footnotes plugin as my first “released to the world” plugin for WordPress. In my opinion it offers a better solution than the others I’ve seen (assuming you don’t want a full service mark-up plugin like Textile). I might one day put it on the WordPress Plugin Repository[4] assuming they eventually make it easier to navigate and use.

Installing the Footnotes WordPress Plugin

For now I have released it as version 0.1 (Beta) and I welcome improvement suggestions. You shouldn’t really need to be told how to install it (because it’s so damn easy) but here goes:

  1. Download it.
  2. Unzip the file footnotes.php to the wp-content/plugins directory of your site.
  3. Enable the plugin in admin.
  4. Start using it.

I’m not putting any restrictions on the use of this plugin, you may do with it what you like. However, I do assert my authorship and copyright. I would appreciate it if you would let me know in the event that you modify this plugin for use or redistribution.

I must acknowledge Mark because I used the same method as he used in his Run PHP plugin to go through the posts and pull out the footnotes.

UPDATE 1 (12 August 2005):

The question has been asked “how do I use this thing?” That’s a fair question, and I’m surprised it wasn’t asked sooner. All you need to do is suround the text you want as a foot note in footnote tags[7]. So your post might look like this: This plugin<footnote>Which you can find here. </footnote> is great for making footnotes in your posts. But you don’t have to type that manually, simply use the “footnote” button that should now appear in your quicktags list when you are writing a post.

UPDATE 2 (14 August 2005):

New Version: 0.2 (beta) New Features:

  • Works with WP-Amazon plugin.
  • Choose if links are superscript or not.
  • Customise the backlink text.[8]
  1. The ABC TechTalk wiki []
  2. The are generated automatically via some mark-up in the text. Check out the DokuWiki mark-up here. []
  3. Simply by having “ref:[footnote number]” in place of the footnote text it will refer back to the footnote of that number. This isn’t the best solution for a document that has heaps of footnotes (especially if you go back and add some in later) but it will do for now. []
  4. If anyone has any idea how to navigate or understand the Plugin Repository page, please let me know. [] []
  5. Which I found via Huddled Masses. []
  6. Although I couldn’t for the life of me get the Alex King one to work (sorry Alex). []
  7. i.e. <footnote> and </footnote> []
  8. To customise the backlink text see the Footnotes tab in the Options admin menu. []

74 Responses to “New WordPress Plugin: Footnotes”


  1. 1 Anne

    Thanks for the plugin. I haven’t used it yet, but I’m sure I will.

  2. 2 jd

    nice plugin, working well… thanks

  3. 3 Mark J.

    I hate to sound dense, but I must be new enough to WordPress that I’m missing something. I’ve downloaded, I’ve installed, I’ve activated… And now how do I put a footnote in a post, please?

  4. 4 Simon

    Wow! Don’t worry, you don’t sound dense, I haven’t explained it well at all and I’m surprised someone didn’t point that out to me sooner. I’ve updated the post with further information and I’ll update the read me file later in the day.

  5. 5 If..Else

    Thanks for the heads up on this plugin.

    It’s working very well indeed.

  6. 6 Rob

    Simon, great plugin. Should do just what I want — and all without javascript too! But … for some reason the quicktags button, though visible, isn’t doing anything. :( Any clues? WP 1.5.3

  7. 7 Simon

    Rob,

    No real idea why the quicktag button wouldn’t be doing what it’s supposed to do. My first guess would be some incompatibility with other plugins that add quicktag buttons. Do you have any? My second guess is some change to the quicktags module. I’ve only tested the plugin with 1.5.1.2. If I get the chance tomorrow I’ll test it with 1.5.3 and see if that’s the culprit and release an update.

    Just to be sure you know, you can still use the plugin with out the quicktags button, see the update at the end of the post.

    S.

  8. 8 Rob

    Simon,

    Yes, there’s an interaction with Rich Manalang’s WP-Amazon plugin. His goes on working but your button stops operating.

    Rob

  9. 9 Simon

    If you downloaded Version 0.2 in the past two minutes (which I highly doubt) you should download it again as there was a slight error relating to referencing an existing footnote.

    S.

  10. 10 Rob

    Simon, thanks for the updated plugin — it works like a charm. If you are looking for suggestions for development you might permit the footnote reference to be enclosed in brackets too.
    Again … Thanks,
    Rob

  11. 11 danithew

    I really like this plugin. It works great though I have only got it functioning on post drafts … so you won’t yet see it in action on my blog. Nevertheless I’ve tested it and it’s great.

    Here’s a question, though it might sound a bit pretentious for a blog. I am wondering how difficult it would be to add a bibliography function to this plugin. That is, in addition to footnotes, I’d like to be able to have a list of cited sources that shows up after the footnotes, just as they would in a typical research paper. I do not know if it would be desirable to create a separate bibliography plugin that would work with the one you’ve already created, or if an all-in-one package would be the way to go.

  12. 12 Simon

    Hi Daniel,

    Thanks for the suggestion, it is certainly something that could be considered for inclusion in a future version. I’m glad you like the plugin. It will be a month or so before I have time to look at the next version but I’ll consider your suggestion then.

    Also thanks to, Rob for the brackets suggestion I’ll definitely put that in next round.

    S.

  13. 13 danithew

    Simon, I appreciate you considering that suggestion. I’ll check back occasionally to see if there are any updates on the matter. Thanks again.

  14. 14 Kapeka

    Hi, cool little plugin. I was looking for an easy way to implement footnotes. This seems very easy, and with doublebrackets, like in Wikipedia it would be even more easy. But I would support Daniels suggestion for a Biblio Plugin. This would make it easier to write some more “academic” posts, with citing books etc.

    GFS
    Karl

  15. 15 Simon

    If anyone has downloaded version 0.2 since it went up, you might have been a little confused and I apologise. I forgot to change the version number in the actual plugin file so it was still appearing as 0.1 (Beta) in the plugin management section of your WP installation. I have updated the download properly now.

    S.

  16. 16 Jennifer

    Love the footnote plugin. I wasn’t even looking for one at the time, but saw your post on the WP forums. Minor question: Can the footnote quicktag be placed before the “Close All Tags” one? It’s not a big deal, but I’d prefer it, if possible. Thanks!

  17. 17 Simon

    Hi Jennifer, thanks for your comments. I’m not sure how to go about placing the quicktag button before the “Close All Tags” button but I’ll look into it for the next iteration.

    S.

  18. 18 Stewart Ugelow

    Hey Simon,

    Nice job with the footnotes plugin. As WordPress from time to time bonks plugins when new versions are released (as happened to one of my plugins in the 1.5 to 1.5.1 leap) you might want to consider ways that the inserted footnotes could gracefully degrade in the absence of your plugin.

    Perhaps you could add an action to the save_post and edit_post hooks that would do an initial parsing for a user’s footnote tags and wrap them in HTML comment tags?

    Anyway, keep up the good work!

  19. 19 Simon

    Hi Stewart,

    Thanks for your comment. I’ve been trying to think of ways that would make this plugin degrade a little more gracefully and your solution is an interesting one. I’ll put that into the suggestion pile for the next version.

    S.

  20. 20 Sam Graf

    Hi Simon,

    Thanks for a well done and useful plugin! It’s excellent to have the option of footnoting.

    One issue that seems to exist on my WordPress install (1.5.2) is that with the footnotes plugin enabled, WordPress’s built-in “textile” feature seems to lose the ability to transform double quotes. I’m not seeing any other impact, just on the double quotes. Thought I’d let you know.

    Thanks again!

    Sam

  21. 21 danithew

    (Sorry for repeating some things — but I want to expand a little more on the previous idea)

    I wonder if someone could build a bibliography function into a footnotes plugin. Perhaps along with the footnote a window would pop up that would offer the ability to enter a line with the name of author/editor, book or magazine article title, publisher, date of publication, etc. The cited works would then show up in a special section that would follow after the footnotes, just like in scholarly articles or books. EndNotes.

    I am currently working on some blog posts about Middle Eastern Studies topics and anyone who could help me to create this kind of post format would have my undying gratitude. I think in time many others would greatly appreciate it as well.

  22. 22 risa

    hi, i’m quite happy to find this plugin as well, i’m going to put it to good use!
    ideally, for me, your next version would make me this much happier:
    when you click on the footnote number and end up down in the footnote, the number there would be a link back up to where you were in the text..you know what i mean? right now we do this with anchors, but bc it’s a bit annoying we don’t do it as often as i’d like.
    if you want, you can see how we’ve been doing it if you scroll down in this post:

    I’d also be really into the bibliography (endnotes-style).

    Thanks a lot, you rock
    risa

  23. 23 Christoph

    This is the single most amazing footnote plugin available today. I have tried three or four others but none works as simply and elegantly. It is also customizable via CSS!

  24. 24 Simon

    I appreciate your comment Christoph. Thanks.

    While I’m here I might just respond to the others I’ve been neglecting.

    risa, I’m not sure about your first comment. As far as I can tell the plugin already has that functionality. As for the bibliography part, it’s certainly under consideration for the next version.

    Sam, thanks for letting me know about the textile incompatibility. I’ll look into that when I get time.

    danithew, Thanks for expanding on your first comment. As I said, I’ll seriously consider the bibliography functionality for the next version. In the mean time if anyone finds anything that sits the purpose please let me know.

    S.

  25. 25 Hapax

    I need footnotes in “Pages” and quicktag doesn’t appear… Is there a solution ? :-)

  26. 26 Simon

    Hi there Hapax,

    Sorry for the rather slow reply. I’m surprised that the quicktag doesn’t appear in the pages editing section of admin but the footnotes do work for pages. All you need to do is manually enter the tag as described in this post.

    S.

  27. 27 Hapax

    Hello,

    I have found something : when I go in the admin backend directly to page-new.php, the quicktag doesn’t appear… But when I modify a page already published, it appears !… ??
    I have desactivate the others plugins but it doesn’t seems there is a conflict, because nothing change. Have you got a idea ? I use WP 1.5.2.

    For articles, no problem ! Wonderfull work anyway ;-)

  28. 28 Simon

    Hi Hapax, thanks for your follow up. I’m going to be flat out for the next week on other work but after that I plan to spend a bit of time on an upgrade for Footnotes. I will investigate this issue then. Thanks again.

    S.

  29. 29 Hapax

    Plzz Help ! I’m afraid whith this :

    Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 1387914 bytes) in /home/eq32002/html/interface/wp-content/plugins/footnotes.php on line 57

    Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 2436 bytes) in /home/eq32002/html/interface/wp-includes/functions.php on line 164

    I absolutely need your plugin and I don’t know how to upper size the post content (already in LONGTEXT).

    Have you got a magic solution ???

    Thankx in advance

  30. 30 Hapax

    Hello,

    It’s me again. After tests I know it isn’t a mysql problem but a power server problem. Too much footnotes.

    So I have cut my page into different pages whith the “nexpage” quicktag… and Miracle, it works again, footnotes too…

    But for each “page” (1, 2, 3, …) footnotes start again at the first footnote number : “1.”
    whitch is catastrophic for scientific readers and printers (make a reference to a specific footnote is impossible).

    I prepare a scientific revue on line and you can see the problem here.

    Only you, the author, can solve this. I’m not good as well. Do you think you can and you have time to do this and you want to do this ? Because the revue must coming out next monday !… It’s a little desesperate.

    Here is the url :
    http://www.cometes.org/la-revue/numeros/n-2-sciences-lettres-classements-et-croisements-xvie-xviiie-siecles/figures-du-lycanthrope-a-lage-baroque/

    Thankx anyway for your plugin. It doesn’t work because of my specific case and my $^$^ù host.

  31. 31 Simon

    First off, wow, that is a huge article. There is a way to fix the problem of the lists restarting for each page of the article, but there are a few issues.

    First, I don’t have time to look at it until the weekend at the earliest - sorry, that’s just the way it is, I have pressing assignments of my own.

    Second, the solution I have in mind is really ugly. It uses depreciated HTML and breaks some of the automation achieved by the footnotes plugin. For this reason I wouldn’t be happy releasing the solution as an update.

    I will look at it on the weekend and try and implement a special version just for you, but if you want to look at it yourself, feel free. You need to insert start or value elements into the lists on subsequent pages.

    You’ve highlighted a fairly big shortcoming of the plugin, so thanks for that I will have a think about a more elegant solution for the next release.

    S.

  32. 32 Stewart Ugelow

    If you declared “global $page” in your swas_footnote function, you could then make the footnote links “$page.’-’.$counter” which would give you 1-1, 1-2, etc for the 1st page and 2-1, 2-2, etc for the 2nd page.

  33. 33 Hapax

    Hello Simon,

    Any help will be a wonderfull gift ! :-)

    Hello Stewart,

    I have tried your hack (but I’m not a hack god) : it works for the footnotes name (now it includes the page number), but the footnote number isn’t incremented (I must change somehing else but I don’t know where).

    I pitch my changes :
    1. I have put “global $page;” at the beginning of function swas_footnote.

    1. I have change the link and the “li” footnote, whitch make :

          foreach($footnotes as $footnote){
          $counter++;
      $data = $data.'ID.'"&gt;'.$footnote.'  '.$current_settings['pre_link'].'<a>ID.'"&gt;'.$current_settings['link'].'</a>'.$current_settings['post_link'].'';
      

    Do you know how to increment the number ? I have made an error but I don’t know where…

    Thanks everyone for hope ;-)!

  34. 34 Hapax

    My code is interpretd here :-x.
    I try with tag “code” :

    2. $counter = 0;
    foreach($footnotes as $footnote){
    $counter++;
    $data = $data.'ID.'">'.$footnote.' '.$current_settings['pre_link'].’ID.’”>’.$current_settings['link'].’‘.$current_settings['post_link'].”;

  35. 35 Hapax

    Sorry for all these messages, but I don’t know how to copy-paste my code in comments and you all can see it…

  36. 36 Simon

  37. 37 Hapax

    Hello Sw’as,

    1000000 thanks for your help and assistance.
    I have a problem with the custom version, the startnum tag is not interpreted. See here :

    http://www.cometes.org/la-revue/numeros/n-2-sciences-lettres-classements-et-croisements-xvie-xviiie-siecles/figures-du-lycanthrope-a-lage-baroque/2/

    There is a space addition between the < and the !. When I erase it, it comes back…

    Do I make a mistake somewhere ?

    Thanks again.

  38. 38 Hapax

    SORRY ! It Works now like a WONDERFULL CHARM ! (I don’t know why it doesn’t works at first but I don’t want to know !)

    So… THANKS AGAIN ;-)

  39. 39 Hapax

    Sorry a lot, It’s me again (I’m so stressed that I have the feeling each hour is another day).

    In fact there is a problem :-). You can see at the url mentionned. Footnotes are incremented at the end of the text (great) but not in the text… So it restart at footnote 1 on page 2 but link to footnote 6…

    Sorry for all these complaints.

  40. 40 Simon

    Far out, I totally overlooked that. Give me 1/2 hour.

    S.

  41. 41 Simon
  42. 42 fústar

    Thanks so much for a splendid little footnotes plugin. It should provide me many happy hours of footnoting fun!

  43. 43 Dgold

    Hello, I want a plugin LIKE THIS EXCEPT it would make automatic footnotes of all hyperlinks in a post where the footnote would be the actual URL with the http://www typed out.

    The reason?

    So that on my “Print” CSS view, if a person actually prints a post, there will be footnotes with READABLE links that can be typed into a browser, not Hyperlinks on underlined words where the address is hidden.

    Could you make this for me? Please email me if possible.

  44. 44 Simon

    Hi Dgold,

    I could write a plugin to do that but there are other, better ones already out there that put all links that you specify into footnotes . If that’s what you want to do (but I don’t think it really is) you should type WordPress and Linknotes into Google.

    If, on the other hand you just want to make your print CSS better by displaying the actual address rather than the link text, I recommend this article on A List Apart. It does exactly what you want!

    S.

  45. 45 Chris Roberts

    Interesting plugin, but there are four lines that have me puzzled:

    $data = str_replace(array(”‘”, “’”), “‘”,$data);
    $data = str_replace(array(”””, ““”), ‘”‘, $data);
    $data = str_replace(”″”, ‘”‘, $data);
    $data = str_replace(”′”, “‘”, $data);

    This is why some users have mentioned that the plugin seems to turn off texturizer. It doesn’t turn it off, it just undoes some of texturizer’s conversions. I’m not sure why these conversions are here, I tried just commenting out these lines and your plugin continued to work fine. Is there a reason to keep these conversions in or can they be safely removed?

  46. 46 Chris Roberts

    and silly me, the web browser converts the entities to their corresponding character. :) But you should recognize those 4 lines - they occur early inside the swas_footnote() function.

  47. 47 kim

    hi there, i just installed the plugin and it’s working great! thanks! but (of course there’s a but…) i would like to align the footnotes to the left and just can’t figure out how to. i know that’S probably a very stupid question, but i’m not that good with php plus i’m germany so all the desciptions are in english which makes it even harder for me. so maybe you can give me a hint… ? thanks alot!

  48. 48 kim

    oh and also: i’d like for the numbers to show in front of the footnotes as well (like they do on this site) — how can i manage to work that? thanks so much again…

  49. 49 noname

    Hi,
    I´using this pluging, but when I trid to pass feed validator (feedvalidator.org), it gives me a error about a tag “” that I thing it´s relating footnotes, because if I deactive the plugin, I pass the validator.
    I tried to read the code to find something like this error (), but nothing.
    Any idea about it??

  50. 50 noname

    </content:encoded>>

  51. 51 Simon

    Hi kim,

    You will need to adjust your CSS in order to manipulate the appearance of the footnotes. For starters, to get the numbers to appear you should only need to add the line:

    list-style-type:decimal;

    to the ol.footnotes element.

    In order to move the footnotes to the left ensure there is no left margin or padding:

    margin-left:0;
    padding-left:0;

    That should do the trick, if not keep mucking about with the CSS you will find a way.

    S.

  52. 52 Simon

    noname,

    Thanks for pointing that out. I’d never bothered to validate the feed with footnotes included. It does actually still produce a valid feed but provides a warning that there are links described as relative URLs IMO that isn’t any problem at all.

    The links it is refering to are the links generated by the plugin to jump between the text and the footnotes. I’ll think about changing it in the next version but it shouldn’t be a problem.

    S.

  53. 53 kim

    thanks alot simon. the margin-trick worked but the numbers still don’t show up… it’s not that big a deal though. not like i have ten footnotes in an entry usually. for me it’S just playing-around… so thanks for your help :)

  54. 54 Spyn_ET

    It’s posible dont work in Wordpress 2.0¿?
    I have problems with it.

  55. 55 Simon

    This version of the plugin is designed for the 1.5 series. It hasn’t been tested at all with 2.0 and probably won’t be until shortly after 2.0 is released.

  56. 56 Simon

    Having just installed WordPress 2.0 (beta) for testing purposes. I can tell you that it definitely does support footnotes. There is obviously no Quicktags button because that whole section has been redesigned. But it will still handle footnotes very well if you just <footnote>insert them like this</footnote>.

    S.

  57. 57 Lou

    A little late to the party but wow, this=amazing. Thanks a lot.

  58. 58 malyfred

    I know that you have changed the implementation of Quicktags button recently to avoid collision with WP-Amazon but could you consider
    http://codex.wordpress.org/Plugins/Miscellaneous and implement the proper way as is shown in Edit Button Template?

    Your (and WP-Amzaon’s) implementation is destroing DOM of the post page and doesn’t work with plugins that are using the recommended way:(

  59. 59 MENJ

    Hello, I am using your Footnotes plugin on one of my sites and I love it. The only problem I found with the plugin is that it doesn’t seem to properly display footnote numbers more than one digit and makes them garbled. You can see an example of this in the following page:

    http://www.bismikaallahuma.org/index.php/articles/the-muslim-scholars-regarding-the-bewitchment-of-the-prophet-muhammad

    I hope you would be able to release a fix for this soon.

    Best regards.

    • MENJ
  60. 60 Simon

    Hi there MENJ, I have had a look at the site you linked too but don’t see any problem with the footnotes.

    S.

  61. 61 menj

    Hi Simon,

    Its odd that you couldn’t see it. Anyway, I am using IE 6.0 and the footnotes from 10 onwards are garbled. You can see a screenshot of it here:

    http://www.flickr.com/photos/menj/77479623/

    I haven’t tested it with any other browser, perhaps it is a specifically IE problem? Anyway, the Footnote plugin you’ve coded is excellent, and I look forward to any future upgrades you may have planned for it in the future.

    Best regards.

    • MENJ
  62. 62 Amir Sariaslan

    Excellent plugin! Thank you!

  63. 63 April

    Thanks a lot. ((hugs))

  64. 64 Unambiguous

    I really appreciate this plugin, it works great.
    However a problem occured when I installed Wordpress 2.0. The default built-in WYSIWYG editor keeps removing tags from my spots. It occurs when I re-open a spot for editing and save the changes.
    Anyone else having the same problem?

  65. 65 Tomjack

    hello, nice blog

  66. 66 Dana

    Can anyone tell me how to put parenthesies ( ) around the the footnote number?

    Thanks :)

  67. 67 menj

    You can change the default [ ] to paranthesis by going to Options > Footnotes. There should be a function there which allows you to make the changes.

  68. 68 Richard W

    Hey there Simon!

    It really is a fantastic plugin - just wondering though, when I use the “more” tag and drop off the long end of the posts, all the footnotes are there on the blog frontpage - underneath the “more” (read on…) link?

    Is there any way that we can hide the footnotes, just like the rest of the article?

    Love to hear what you have to say?

    Cheers, Richard

  69. 69 Richard W

    Hey again Simon…

    …forget the last comment - I found that if there was a “footnote” tage above the “more” tag then it appeared below the “more” extender.

    But if the “footnote” tag is below the “more” tag then it vanishes from the trunkated post!

    :-)

    Will just have to make sure not to use footnotes in the 1st paragraph!

    Thanks!

    Rich!

  70. 70 Patrick

    Hi!

    I’ve used the footnote plugin for the past weeks with great success. Now I wonder: will this work with Wordpress 2.0?

  71. 71 kding

    Hi, I used this lugin with 2.0. It works fine but I have two problems. (1)no button on quicktag; (2)once you have deployed your post, the footnoot works. But if you click edit, the all footnoot tags are stripped out. so you have to retype in the . I don’t know if this is just my problem or a general trick. I would appreciate it if these problems can be solved.

  72. 72 Simon

    Thanks for the comments, Patric and kding. Patrick, I think kding answered your question for now.

    kding, I know about those problems with 2.0. Unfortunately I’m just a tad busy on other things at the moment. I will have a 2.0 version out as soon as I can manage it.

    S.

  73. 73 kding

    Thank you, Simon. I will be looking forward to it.

  74. 74 Simon

    I’m turning comments off on this post for now because I’m getting far too much spam and it’s pissing me off.

    I hope there aren’t too many people subscribed to the comments because it’s probably pissing them off as well. If that’s you, I’m sorry.

    S.

  1. 1 St. Jerome’s Library
  2. 2 If..Else Log
  3. 3 sw’as » WordPress Plugin: Footnotes Version 0.2
  4. 4 WordPress Station » Blog Archive » New Plugin: Footnotes
  5. 5 sw’as » Spate of plugin installations
  6. 6 Anti-Idiotarian Rottweiler » Blog Archive » This is a test for George
  7. 7 ClioWeb | Blog Archive » Footnote Plugin for Wordpress
  8. 8 sw’as » Nerky? Geerdy?
  9. 9 reality » Blog Archive » ????Blog
  10. 10 wongaBlog
  11. 11 Pootus’ Place » Blog Archive » Intalled Footnote Plugin
  12. 12 Tron » Blog Archive » prueba
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  17. 17 aNieto2K » FootNotes
  18. 18 gersbo.dk » Blog Archive » WordPress Plugins & Themes
  19. 19 sw’as » Footnotes 0.9 Plugin for WordPress 2.0.x
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