\begin{thebibliography}{1}

\bibitem{key-1} Philippe Breton, \emph{História da Informática}, Editora Unesp, 1987

\bibitem{key-2} Walter Savitch, \emph{Java, An Introduction to Computer Science \& Programming}, second edition, Prentice Hall, 2001

\bibitem{key-3} Samuel N. Kamin, M. Dennis Mickunas and Edward M. Reingold, \emph{An Introduction to Computer Science Sing Java, McGraw-Hill, 1998}

\end{thebibliography}
