\begin{filecontents}{quellen.bib}
@book{test,
author = {K. Klaus and H. Hinz and K. Kunz and S. Schmidt},
title = {Ueber das Schreiben von Blindtexten},
year = {2005},
address = {Berlin}
}
@book{xmpl,
author = {A. Apfel and W. Zandt},
title = {Ueber das Husten am Arbeitsplatz},
year = {1902},
address = {Olbershausen}
}
\end{filecontents}
\documentclass[a5paper,12pt]{scrartcl}
\usepackage[square]{natbib}
\begin{document}
\cite{test}\par \cite{xmpl}\par % Kurzversion
\bigskip
\cite*{test}\par \cite*{xmpl} % lange Version
\bibliographystyle{natdin}%
\bibliography{quellen}
\end{document}
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