%%
%% The LaTeX Companion, 3ed
%%
%% Example 16-3-17 on page II-494 in "Full author list only with the first citation".
%%
%% 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{207.0pt}

%% 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[longnamesfirst]{natbib}
\bibliographystyle{agsm}
%StopShownPreambleCommands

\begin{document}
\citep{LGC97} \hfill first citation  \\
\citep{LGC97} \hfill         second  \\
\citep*{LGC97}\hfill   names forced  \\
\citet{LGC97}                        \\
\citep[e.g.,][]{LGC97}               \\
\citeauthor{LGC97}
\end{document}