\documentclass[12pt,a4paper]{scrreprt}
\usepackage[square, numbers]{natbib}
\begin{document}
Blabla \citet{petz08}.
\bibliographystyle{plaindin}
\bibliography{Literatur}
\end{document}
%@Book{petz08,
%author = {Dude Petz},
%title = {Quantum Information Theory and Statistics},
%publisher = {Springer},
%year = 2008
%}Blabla (author?)[1].
Das Literaturverzeichnis wird korrekt dargestellt. Was mache ich falsch?

