%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{vdg1998} vdg. (1998, 12.11.1998). Canton de Berne : succ{\`e}s du projet pilote {\textquotedblleft}ecstasy{\textquotedblright}. \textit{La Libert{\'e}}, 18.

\end{thebibliography}

\end{document}

