%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Biksham_etal1991} {\textquotedblleft}\textit{Heavy metal distribution in the Godavari river basin}{\textquotedblright}. Biksham G, Subramanian V, Ramanathan A, Van Grieken R, Environmental geology and water sciences \textbf{17}, 117 (1991)

\end{thebibliography}

\end{document}

