\begin{flushleft}
\begin{thebibliography}{MM}
\bibitem[SRGP 1990]{SRGP} Simple Raster Graphics Package \emph{from
    Computer Graphics: Principles and Practice} by Foley, vanDam,
  Feiner and Hughes. Available from
  \url{http://www.cs.brown.edu/software/catalog.html} \bibitem[PTC
  1998]{PTC} Prometheus Truecolour 2.0. A graphics API available from
  \url{http://www.gaffer.org/ptc/} \bibitem[OpenGL 1999]{OpenGL}
  OpenGL. A graphics API available from
  \url{http://www.sgi.com/software/opengl/} \bibitem[Mesa 1999]{Mesa}
  Mesa. The free OpenGL work-alike graphics API available from
  \url{http://www.mesa3d.org/}
\end{thebibliography}
\end{flushleft}

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