%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example 12-3-22 on page 707.
%%
%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
%%    Johannes Braams, David Carlisle, and Chris Rowley
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.0pt}
% small headings for the example
\makeatletter
\renewcommand\section{\@startsection{section}{1}{\z@}%
                                    {1.25ex \@plus1ex \@minus.2ex}%
                                    {.5ex}%
                                    {\normalfont\normalsize\bfseries}}
\makeatother
\StartShownPreambleCommands
\usepackage{natbib}
\bibliographystyle{abbrvnat}
\renewcommand\bibsection{\section{\refname}}
\newcommand\bibpreamble{Some material
     inserted between heading and list.\par}
\newcommand\bibfont
                 {\footnotesize\raggedright}
\setlength\bibhang{30pt}
\setlength\bibsep{1pt plus 1pt}
\StopShownPreambleCommands
\begin{document}
Entries with multiple authors might be
problematical, e.g., \cite{LGC97} and
\cite{test97} or even \cite{LGC97,test97}.
But then they might not.
\bibliography{tex}
\end{document}