%%
%% The LaTeX Companion, 3ed
%%
%% Example 16-3-20 on page II-495 in "Customizing the citation reference layout".
%%
%% 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{183.0pt}

%% Do not show the bibliography itself in the example,
%% so put it on a separate page:
\AtEndDocument{\newpage\bibliography{tlc}}
\setlength\parindent{0pt}

%StartShownPreambleCommands
\usepackage{natbib} \bibliographystyle{agu}
%StopShownPreambleCommands

\begin{document}
\citet{LGC97}  \\  \citep{Knuth-CT-a,LWC99} \\
\citep[see][chap.~2]{Knuth-CT-a}
\end{document}