%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{5}

\bibitem{Porter+Wratten2014} Porter, J. R., \& Wratten, S. (2014). National carbon stocks: Move on to a carbon currency standard. \textit{Nature}, \textit{506}, 295.

\end{thebibliography}

\end{document}

