%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Vilvert_etal2018} Vilvert, E., Lana, M., Zander, P., \& Sieber, S. (2018). Multi-model approach for assessing the sunflower food value chain in Tanzania. \textit{Agric. Syst.}, \textit{159}, 103--110.

\end{thebibliography}

\end{document}

