\begin{thebibliography}{KR88}

\bibitem[KR88]{k&r}
Brian~W. Kernighan and Dennis~M. Ritchie.
\newblock {\em The C programming language}.
\newblock Prentice-Hall, second edition, 1988.
\newblock ISBN: 0-13-110362-8.

\end{thebibliography}