\begin{thebibliography}{1}

\bibitem{knuth:literate}
Donald~E. Knuth.
\newblock Literate programming.
\newblock {\em The Computer Journal}, 27(2):97--111, 1984.

\bibitem{dahl:structured}
Ole-Johan Dahl, Edsger~W. Dijkstra, and C.~A.~R. Hoare.
\newblock {\em Structured Programming}.
\newblock Academic Press, London and New York, 1972.

\end{thebibliography}