%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Huesler+Plancherel2007} H{\"u}sler, G., \& Plancherel, B. (2007). Social integration of adolescents at risk : results from a cohort study. \textit{Vulnerable Children and Youth Studies}, \textit{2}(3; 12/2007), 215--226.

\end{thebibliography}

\end{document}

