Hier ist ein Minimalbeispiel:
\documentclass{scrbook}
\usepackage[style=authoryear]{biblatex}
\bibliography{literatur}
\begin{document}
\nocite{Science}
\printbibliography
\end{document}@ARTICLE{Science,
author = {James Badro and Jean-Pascal Rueff and Gyoergy Vanko and Giulio Monaco
and Guillaume Fiquet and Francois Guyot},
title = {Elektronic Transitions in Perovskite: Possible Nonconvecting Layers in the Lower Mantle},
journal = {Sience},
year = {2004},
volume = {305},
pages = {383-386}
}