%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{SuchtpraeventionAargau2012} Suchtpr{\"a}vention Aargau. (2012). \textit{Suchtpr{\"a}vention Aargau : Jahresbericht 2011}. Aarau: Author.

\end{thebibliography}

\end{document}

