\begin{thebibliography}{1}

\bibitem{goossen}
Michel Goosens, Frank Mittelbach, and Alexander Samarin.
\newblock {\em The LaTeX Companion}.
\newblock Addison-Wesley, 1994.

\bibitem{leslie2000}
Leslie Lamport.
\newblock {\em LaTeX - User’s Guide and Reference Manual}.
\newblock Addison-Wesley, 2000.

\bibitem{mittel}
Michel Goosens, Sebastian Rahtz, and Frank Mittelbach.
\newblock {\em The LaTeX Graphics Companion}.
\newblock Addison-Wesley, 1998.

\bibitem{botelho}
Geraldo Botelho, Daniel Pellegrino, and Eduardo Teixeira.
\newblock {\em LaTeX - User’s Guide and Reference Manual}.
\newblock Editora SBM, 2012.

\end{thebibliography}
