%&LaTeX
\documentclass{article}

\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}

\begin{document}

\begin{thebibliography}{1}

\bibitem{Ahmed1994} Ahmed, S. M. (1994). Surface chemical methods of forming hardpan in pyrrhotite tailings and prevention of the acid mine drainage.

\end{thebibliography}

\end{document}

