%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Bolzicco_etal2004} Bolzicco, J., Carrera, J., \& Ayora, C. (2004). Eficiencia de la barrera permeable reactiva de Aznalcollar (Sevilla, Espana) como remedio de aguas acidas de mina. Reactive permeable disposal barrier at Aznalcollar Mine, Seville, Spain; as remediation for acid mine drainage. \textit{Revista Latino-Americana de Hidrogeologia}, \textit{4}, 27--34.

\end{thebibliography}

\end{document}

