%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Bruelhart2009} Br{\"u}lhart, B. (2009). quint-essenz am Beispiel des Projektes Input f{\"u}r Output. \textit{SuchtMagazin}, \textit{35}(2; 04/2009), 31--34.

\end{thebibliography}

\end{document}

