%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Xu_etal2007} Xu, F., Ma, M., \& Wu, Y. - Q. (2007). \textit{Population density and habitat utilization of ibex in Tomur National Nature Reserve,Xinjiang,China}.

\end{thebibliography}

\end{document}

