%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Villegas1991} Villegas, J. (1991). Humor, sexualidad y desenga{\~n}o en la {\textquotedblleft}Celestina{\textquotedblright} de Alfonso Sastre. \textit{Anthropos: Revista de Documentacion Cientifica de la Cultura}, 126, 57--59.

\end{thebibliography}

\end{document}

