%&LaTeX
\documentclass{article}

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

\begin{document}

\begin{thebibliography}{1}

\bibitem{Deyermond1999} Deyermond, A. D. (1999). Motivaci{\'o}n sencilla y motivaci{\'o}n doble en {\textquotedblleft}La Celestina{\textquotedblright}. \textit{Insula}, 633, 13--15.

\end{thebibliography}

\end{document}

