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I need to extend the limit for references in BibTeX, it won't let me go over 20 and if I do just comes up with a warning in the Console Output that there are undefined references even though I have both defined and cited them.

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Please post a short example with 20+ references and the error shown in the console. – Alexis Pigeon May 19 '12 at 10:49
Please be sure to indicate which document class and which bibliography style file you're using. I've never before heard of a limit of 20 entries in a BibTeX-generated list of references. – Mico May 19 '12 at 10:59
i47.tinypic.com/2envnue.jpg This is a screenshot, I am using report document class and IEEE referencing style – Michael May 19 '12 at 11:05
I have also posted on LaTeX community, the .log and .blg file has been uploaded on there as well latex-community.org/forum/viewtopic.php?f=50&t=20474 – Michael May 19 '12 at 11:26
@Michael: Thanks for posting the links. The .blg file lists two errors that bibtex encountered. (One is a case mis-match in the citation key, the other is about an invalid field -- you can't comment out fields with %.) Do things get any better after you've fixed these errors? – Mico May 19 '12 at 11:54
up vote 1 down vote accepted

The problem was caused by missing field names, as it has been found on LaTeX-Community.org: Extend Bibliography Database Size.

This error in the .blg file pointed to the problem:

You're missing a field name---line 12 of file thesis.bib
 :     %volume   = "",
(Error may have been on previous line)
I'm skipping whatever remains of this entry

After it was fixed, the problem was gone.

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