%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Mao_etal2009} {\textquotedblleft}\textit{Combining HPLC-GCXGC, GCXGC/ToF-MS, and selected ecotoxicity assays for detailed monitoring of petroleum hydrocarbon degradation in soil and leaching water}{\textquotedblright}. Mao D, Lookman R, van de Weghe H, Weltens R, Vanermen G, de Brucker N, Diels L, Environmental science and technology \textbf{43}, 7651 (2009).   http://doi.org/10.1021/ES9015603

\end{thebibliography}

\end{document}

