%%
%% The LaTeX Companion, 3ed
%%
%% Example 16-2-2 on page II-476 in "Customizing citation references and the bibliography in standard \LaTeX {}".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.0pt}

%% Do not show the bibliography itself in the example,
%% so put it on a separate page:
\AtEndDocument{\newpage\bibliography{tlc}}

%StartShownPreambleCommands
\bibliographystyle{plain}  \usepackage{ifthen}
\makeatletter
\renewcommand\@cite[2]{({#1\ifthenelse
    {\boolean{@tempswa}}{,\nolinebreak[3] #2}{}})}
\makeatother
%StopShownPreambleCommands

\begin{document}
Color support for \LaTeX{} is described in \cite{LGC97} and
the \texttt{hyperref} package in \cite[pp.\,35--67]{LWC99}.
\end{document}