%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-4-14 on page I-187 in "Further configuration possibilities".
%%
%% 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{183.0pt}

  \setlength\parindent{0pt}     % -- no par indentation for example
  \setlength\leftmargini{1.5em} % -- shorten quote indentation for example

%StartShownPreambleCommands
\usepackage{csquotes}
\renewcommand\mkenddispquote[2]
    {#1\hspace*{\stretch{1}}\nolinebreak[3]%
       \hspace*{\stretch{1}}\mbox{#2}}
%StopShownPreambleCommands

\begin{document}
He said: \begin{displayquote}[Umberto Eco][.]
  Our life is full of empty space
\end{displayquote}
and \begin{displayquote}[Douglas Adams]
  Space is big. You just won't believe how
  \textelp{} big \textelp{}
\end{displayquote}
\end{document}