%%
%% The LaTeX Companion, 3ed
%%
%% Example 16-4-10 on page II-507 in "biblatex's approach to author-number references".
%%
%% 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{249.0pt}

\setlength\parindent{0pt}
% Use biber program
\makeatletter
\renewcommand\section{\@startsection {section}{1}{\z@}%
                       {-2.5ex \@plus -1ex \@minus -.2ex}%
                       {1.3ex}%
                       {\normalfont\large\bfseries}}
\makeatother
\usepackage{microtype}

%StartShownPreambleCommands
\usepackage[style=ext-authornumber,
            isbn=false]{biblatex}
\addbibresource{tlc.bib}
\DeclareDelimFormat[bib]
    {namenumberdelim}{\\*}
\DeclareDelimFormat[bib]
    {nametitledelim}{\addspace}
\renewcommand\bibnamedash
    {\hspace*{\leftmargin}}

%StopShownPreambleCommands

\begin{document}
\cite{Knuth:TB10-1-31,%
      vLeunen:92,Knuth-CT-a}
\printbibliography
\end{document}