[Tex/LaTex] Natbib confused with same first author and year but different coauthors

bibliographieschicago-stylecitingnatbib

I want to cite the three papers by same first author but different coauthors all published in the same year.
This gives me an error: the same citation without distinguishing or adding extra letter.

\documentclass[11pt]{article}
\usepackage{natbib}
\begin{document}
\title{Natbib confused with same first author and year but different coauthors}
\maketitle
 \section{Introduction}
 I want to cite the three papers by same first author but different coauthors
 all published in the same year \cite{roy_05a}, \cite{roy_05b}, \cite{roy_05c}.
\bibliographystyle{chicago}
\bibliography{testBib}
\end{document}

Here the testBib.bib

@article{roy_05a,
Author = {Roy, S. and Xu, S. and Yang, W.},
Journal = {New Journal},
Pages = {1333-1341},
Title = {A new paper in new journal},
Volume = {10},
Year = {2005},
}

@inProceedings{roy_05b,
Author = {Roy, S. and Xu, S. and Yang, W. and Zung, T.},
BookTitle = {4th Journal conference proceedings},
Pages = {1291 -- 1298},
Title = {Another new paper},
Volume = {18E23},
Year = {2005},
place={USA}
}
@article{roy_05c,
Author = {Roy, S. and Yang, W. and Zung, T. and Zang, J.},
Journal = {Other Journal},
Pages = {123-134},
Title = {Another new paper in new journal},
Volume = {11},
Year = {2005},
}

After building, this gives me

enter image description here

Best Answer

I think your setup isn't right: If you want to use the chicago bibliography style, you should also use the chicago citation management package rather than the natbib citation management package. With the chicago citation management package in use, you'll get unambiguous citation call-outs, as the screenshot below demonstrates.

By the way, the BibTeX bibliography style called chicago was last changed in 1992 [!] and, as such, is based on the 13th edition of "The Chicago Manual of Style". If you want a "chicago" style that's based on the current, i.e., 16th edition of the Chicago Manual (2010), you should look into switching to biblatex and using the biblatex-chicago package.

enter image description here

\RequirePackage{filecontents}
\begin{filecontents}{testBib.bib}
@article{roy_05a,
Author = {Roy, S. and Xu, S. and Yang, W.},
Journal = {New Journal},
Pages = {1333-1341},
Title = {A new paper in new journal},
Volume = {10},
Year = {2005},
}
@inProceedings{roy_05b,
Author = {Roy, S. and Xu, S. and Yang, W. and Zung, T.},
BookTitle = {4th Journal conference proceedings},
Pages = {1291-1298},
Title = {Another new paper},
Volume = {18E23},
Year = {2005},
place={USA}
}
@article{roy_05c,
Author = {Roy, S. and Yang, W. and Zung, T. and Zang, J.},
Journal = {Other Journal},
Pages = {123-134},
Title = {Another new paper in new journal},
Volume = {11},
Year = {2005},
}
\end{filecontents}

\documentclass[11pt]{article}
%\usepackage[round]{natbib}
\usepackage{chicago} % <--- new
\bibliographystyle{chicago}

\begin{document}
\cite{roy_05a}

\cite{roy_05b}

\cite{roy_05c}
\bibliography{testBib}
\end{document}
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