%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{various1988} various. (1988). \textit{Drogenproblematik im Wandel : Symposium organisiert von der Carl Koechlin-Stiftung}  (D. Thommen, Ed.). Lausanne: ISPA-Press.

\end{thebibliography}

\end{document}

