%%
%% The LaTeX Companion, 3ed
%%
%% Example 15-3-4 on page II-397 in "The structure of a name".
%%
%% 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{263.0pt}

%  Use biber program
\makeatletter
\DeclareRobustCommand\BibTeX{B\kern
                    -.05em{\csname S@\f@size\endcsname
                               \math@fontsfalse
                               \fontsize\sf@size\z@\selectfont I\kern-.025emB}\kern-.08em\TeX}
\renewcommand\section{\@startsection{section}{1}{\z@}%
                                    {-1.25ex \@plus-1ex \@minus-.2ex}%
                                    {.5ex}%
                                    {\normalfont\normalsize\bfseries}}
\makeatother
\setlength\parindent{0pt}
\AddToHook{package/biblatex/after}{\setlength\bibitemsep{0pt}} % save some space in the printed example

%StartShownPreambleCommands
\usepackage[style=alphabetic]
      {biblatex}
\addbibresource{tlc-ex.bib}
%StopShownPreambleCommands

\begin{document}
\nocite{prefix-both,
  label-bibtex,apostroph-both}
\nocite{prefix-biber,
  label-biber,apostroph-biber}
\AtNextBibliography
       {\footnotesize}
\printbibliography
\end{document}