%%
%% The LaTeX Companion, 3ed
%%
%% Example 16-7-19 on page II-554 in "Printing the bibliography".
%%
%% 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}

%  Use biber program
\makeatletter
\renewcommand\section{\@startsection{section}{1}{\z@}%
                                    {-1.25ex \@plus-1ex \@minus-.2ex}%
                                    {.5ex}%
                                    {\normalfont\normalsize\bfseries}}
\makeatother
\setlength\parindent{0pt}

%StartShownPreambleCommands
\usepackage[style=authoryear]{biblatex}
\addbibresource{tlc.bib}
\defbibcheck{before1988}{%
 \iffieldint{year}{%
   \ifnumless{\thefield{year}}{1988}%
      {}{\skipentry}}%
   {\skipentry}}
%StopShownPreambleCommands

\begin{document}
\nocite{*}
\printbibliography[heading=none,
                   check=before1988]
\end{document}