%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{5}

\bibitem{Sieber_etal2013} Sieber, S., Amjath-Babu, T. S., McIntosh, B. S., Tscherning, K., M{\"u}ller, K., Helming, K., et al. (2013). Evaluating the characteristics of a non-standardised Model Requirements Analysis (MRA) for the development of policy impact assessment tools. \textit{Env. Model. Softw.}, \textit{49}, 53--63.

\end{thebibliography}

\end{document}

