%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Centresdaideetdeprevention2011} Centres d{\textquoteright}aide et de pr{\'e}vention. (2011). \textit{Fiesta : rapport d{\textquoteright}activit{\'e} 2010}. Sion: Ligue valaisanne contre les toxicomanies (LVT), Centres d{\textquoteright}aide et de pr{\'e}vention.

\end{thebibliography}

\end{document}

