%&LaTeX
\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}

\begin{document}

\begin{thebibliography}{1}

\bibitem{Buecheli_etal2010} B{\"u}cheli, A., Quinteros-Hungerb{\"u}hler, I., \& Schaub, M. (2010). Evaluation der Partydrogenpr{\"a}vention in der Stadt Z{\"u}rich. \textit{SuchtMagazin}, \textit{36}(5; 10/2010), 41--47.

\end{thebibliography}

\end{document}

