If I use this code:
\documentclass[10pt,a5paper,twoside]{memoir}
\begin{document}
\cite{abntex2classe}
\bibliography{refs2}
\end{document}
I win:
LaTeX Warning: Citation `abntex2classe' on page 1 undefined on input line 5.
LaTeX Warning: There were undefined references.
But if I run this other:
\documentclass[10pt,a5paper,twoside]{abntex2}
\usepackage[hyperpageref]{backref}
\usepackage[alf]{abntex2cite}
% Package hyperref Warning: Token not allowed in a PDF string?
% https://tex.stackexchange.com/questions/384885/package-hyperref-warning-token
\pdfstringdefDisableCommands{\let\uppercase\relax}
\begin{document}
\tableofcontents*
\chapter[Nullam]{Nullam elementum}
Nullam elementum
\section[Some encoding tests]{showfont}
Nullam elementum \cite{abntex2classe} Nullam elementum
\bibliography{refs2}
\end{document}
It works correctly. How can that happen?
This is the contents of refs2.bib:
@manual{abntex2classe,
Author = {abnTeX2 and Lauro},
Organization = {Equipe abnTeX2},
Title = {A classe abntex2},
Note = {Substitui \cite{abntex2classe2}},
Year = {2013}}
@manual{abntex2classe2,
Author = {abnTeX2 and Lauro},
Organization = {Equipe abnTeX2},
Title = {A classe abntex2},
Year = {2013}}
I think I should load some package, but I had already looked over the question LaTeX Warning: Citation undefined but they do not seem to be loading any package for bibliography.
For compilation I run pdflatex, bibtex, pdflatex, pdflatex, full log:
This is pdfTeX, Version 3.14159265-2.6-1.40.18 (MiKTeX 2.9.6400) (preloaded format=pdflatex 2017.8.23) 25 AUG 2017 16:34
entering extended mode
**./test3.tex
(test3.tex
LaTeX2e <2017-04-15>
Babel <3.12> and hyphenation patterns for 76 language(s) loaded.
(D:\User\Documents\latex\texmfs\install\tex\latex\memoir\memoir.cls
Document Class: memoir 2016/05/16 v3.7f configurable book, report, article docu
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(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\ifpdf.sty
Package: ifpdf 2017/03/15 v3.2 Provides the ifpdf switch
)
(D:\User\Documents\latex\texmfs\install\tex\latex\ifetex\ifetex.sty
Package: ifetex 2011/12/15 v1.2 ifetex
(D:\User\Documents\latex\texmfs\install\tex\plain\ifetex\ifetex.tex))
(D:\User\Documents\latex\texmfs\install\tex\generic\ifxetex\ifxetex.sty
Package: ifxetex 2010/09/12 v0.6 Provides ifxetex conditional
)
(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\ifluatex.sty
Package: ifluatex 2016/05/16 v1.4 Provides the ifluatex switch (HO)
Package ifluatex Info: LuaTeX not detected.
)
\stockheight=\skip44
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(D:\User\Documents\latex\texmfs\install\tex\latex\memoir\mem10.clo
File: mem10.clo 2008/01/30 v0.3 memoir class 10pt size option
)
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\beforeepigraphskip=\skip124
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LaTeX Info: Redefining \em on input line 7551.
LaTeX Info: Redefining \emph on input line 7559.
\tocentryskip=\skip128
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LaTeX Info: Redefining \: on input line 12068.
LaTeX Info: Redefining \! on input line 12070.
\c@ism@mctr=\count119
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Package abstract [2008/07/23] emulated by memoir.
Package appendix [2008/07/23] emulated by memoir.
Package array [2008/09/09] emulated by memoir.
Package booktabs [2016/05/16] emulated by memoir.
Package ccaption [2008/07/23] emulated by memoir.
Package changepage [2008/07/23] emulated by memoir.
Package chngcntr [2008/07/23] emulated by memoir.
Package chngpage [2008/07/23] emulated by memoir.
Package crop emulated by memoir.
Package dcolumn [2008/07/23] emulated by memoir.
Package delarray [2008/07/23] emulated by memoir.
Package enumerate [2008/07/23] emulated by memoir.
Package epigraph [2008/07/23] emulated by memoir.
Package ifmtarg [2008/07/23] emulated by memoir.
Package index [2008/07/23] emulated by memoir.
Package makeidx [2008/07/23] emulated by memoir.
Package moreverb [2008/07/23] emulated by memoir.
Package mparhack [2008/07/23] emulated by memoir.
Package needspace [2008/07/23] emulated by memoir.
Package newfile [2008/07/23] emulated by memoir.
Package nextpage [2008/07/23] emulated by memoir.
Package pagenote [2008/07/23] emulated by memoir.
Package parskip [2008/07/23] emulated by memoir.
Package patchcmd [2008/07/23] emulated by memoir.
Package setspace [2008/07/23] emulated by memoir.
Package shortvrb [2008/07/23] emulated by memoir.
Package showidx [2008/07/23] emulated by memoir.
Package tabularx [2008/07/23] emulated by memoir.
Package titleref [2008/07/23] emulated by memoir.
Package titling [2008/07/23] emulated by memoir.
Package tocbibind [2008/07/23] emulated by memoir.
Package tocloft [2008/07/23] emulated by memoir.
Package tocvsec2 [2008/07/23] emulated by memoir.
Package verbatim [2008/07/23] emulated by memoir.
Package verse [2008/07/23] emulated by memoir.
(D:\User\Documents\latex\texmfs\install\tex\latex\memoir\mempatch.sty
Package: mempatch 2009/07/24 v6.0f Patches for memoir class v1.6180339
))
(D:\User\Dropbox\Applications\SoftwareVersioning\SublimeText\Data\Cache\LaTeXTo
ols\3fadaf268cce53dfbb2db491bf19775c\test3.aux)
\openout1 = `test3.aux'.
LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 3.
LaTeX Font Info: ... okay on input line 3.
LaTeX Font Info: Checking defaults for T1/cmr/m/n on input line 3.
LaTeX Font Info: ... okay on input line 3.
LaTeX Font Info: Checking defaults for OT1/cmr/m/n on input line 3.
LaTeX Font Info: ... okay on input line 3.
LaTeX Font Info: Checking defaults for OMS/cmsy/m/n on input line 3.
LaTeX Font Info: ... okay on input line 3.
LaTeX Font Info: Checking defaults for OMX/cmex/m/n on input line 3.
LaTeX Font Info: ... okay on input line 3.
LaTeX Font Info: Checking defaults for U/cmr/m/n on input line 3.
LaTeX Font Info: ... okay on input line 3.
LaTeX Warning: Citation `abntex2classe' on page 1 undefined on input line 5.
(D:\User\Dropbox\Applications\SoftwareVersioning\SublimeText\Data\Cache\LaTeXTo
ols\3fadaf268cce53dfbb2db491bf19775c\test3.bbl) [1{D:/User/Documents/latex/texm
fs/data/pdftex/config/pdftex.map}
]
(D:\User\Dropbox\Applications\SoftwareVersioning\SublimeText\Data\Cache\LaTeXTo
ols\3fadaf268cce53dfbb2db491bf19775c\test3.aux)
LaTeX Warning: There were undefined references.
)
Here is how much of TeX's memory you used:
3525 strings out of 493314
48155 string characters out of 3134142
130135 words of memory out of 3000000
7126 multiletter control sequences out of 15000+200000
4899 words of font info for 18 fonts, out of 3000000 for 9000
1141 hyphenation exceptions out of 8191
30i,10n,22p,129b,219s stack positions out of 5000i,500n,10000p,200000b,50000s
<D:/User/Documents/latex/texmfs/install/fonts/type1/public/amsfonts/cm/cmbx10
.pfb><D:/User/Documents/latex/texmfs/install/fonts/type1/public/amsfonts/cm/cmr
10.pfb>
Output written on D:\User\Dropbox\Applications\SoftwareVersioning\SublimeText\D
ata\Cache\LaTeXTools\3fadaf268cce53dfbb2db491bf19775c\test3.pdf (1 page, 18088
bytes).
PDF statistics:
14 PDF objects out of 1000 (max. 8388607)
0 named destinations out of 1000 (max. 500000)
1 words of extra memory for PDF output out of 10000 (max. 10000000)
Best Answer
In your first code (class
memoir) you have a missing\bibliographystyle{}in your code. The bibliography style defines the layout of your bibliography. Because I do not know which style you need I just usedplain.So the following MWE
results in
I do not know your second used class
abntex2, but it seems that it predefined a special bibliography style to be used. Therefore you need not to add an own bibliography style.