I started using BibLaTeX with the APA style, and I noticed that if two dates are the same (including n.d.), a label will be added to the year (e.g. 2016b or n.d.-b). I would like to remove these.

Here is a MWE:









with mwe.bib containing:

author = {{TutorialsPoint}},
title = {{SLDC -- Iterative Model}},
url = {http://www.tutorialspoint.com/sdlc/sdlc_iterative_model.htm},
date = {},
urldate = {2016-04-09}

author = {{TutorialsPoint}},
title = {{SLDC -- V-Model}},
url = {http://www.tutorialspoint.com/sdlc/sdlc_v_model.htm},
date = {},
urldate = {2016-04-09}

Output with dates: Labels 'a' and 'b' added after years

Output with no dates: Labels 'a' and 'b' added after entries with 'n.d.'

Is there any way to remove these labels? This assignment requires the APA style to be used. I am currently using MiKTeX v2.9.

  • But how can you then tell apart the two citations in the text? \AtEveryCitekey{\clearfield{extrayear}}\AtEveryBibitem{\clearfield{extrayear}} I believe you will lose APA compliance if you apply these changes, biblatex-apa adheres to the APA rules quite strictly. BTW: It should probably only be style=apa in the biblatex options. – moewe Apr 9 '16 at 15:51
  • @moewe I don't know, but my teacher doesn't want them. The answer you gave me works, though. – Nicolas Gnyra Apr 9 '16 at 15:53
  • 1
    Maybe you should ask your teacher what to do if you have two works from the same year by the same author. – moewe Apr 9 '16 at 15:56

You can get rid of the extrayear fields with


You will probably lose APA compliance that way and finding the right entry in the bibliography becomes a game of chance.

  • 1
    Is there a way to selectively get rid of the extrayear fields only when the year field is "n.d."? – np8 Aug 20 '16 at 15:15
  • @np8 Are you still using bibatex-apa? Anyway, I believe that warrants asking a new question (I haven't really checked, but it might be a bit more complicated than what I used here). – moewe Aug 21 '16 at 6:25
  • By biblatex-apa do you mean the style parameter? I have bibstyle=authoryear and citestyle=numeric-comp, but I have not used a style parameter. – np8 Aug 21 '16 at 8:26
  • @np8 Aha, would you mind posting a question with an MWE? Then I can have a look. (I just experimented with the styles you mention and did not see any "n.d.".) – moewe Aug 21 '16 at 11:03

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