%&LaTeX
\documentclass{article}

\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}

\begin{document}

\begin{thebibliography}{1}

\bibitem{Wolkersdorfer+Younger2002} Wolkersdorfer, C., \& Younger, P. L. (2002). Passive mine water treatment as an alternative to active systems. \textit{Grundwasser}, \textit{7}(2), 67--77.

\end{thebibliography}

\end{document}

