%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Zobel_etal1999} Zobel, F., Gervasoni, J. - P., \& Jeannin, A. (1999). \textit{Toxicomanie : enqu{\^e}te aupr{\`e}s des partenaires de l{\textquoteright}OFSP}. rds, 43. Lausanne: Institut universitaire de m{\'e}decine sociale et pr{\'e}ventive (IUMSP).

\end{thebibliography}

\end{document}

