\begin{thebibliography}{4}
\expandafter\ifx\csname natexlab\endcsname\relax\def\natexlab#1{#1}\fi
\expandafter\ifx\csname url\endcsname\relax
  \def\url#1{{\tt #1}}\fi

\bibitem[Daly(1997)]{Daly97}
Patrick~W. Daly.
\newblock Natural sciences citations and references.
\newblock Available electronically at {\tt
  ftp://ftp.freesoftware.com/pub/tex/ctan/macros/contrib/supported/natbib},
  1997.

\bibitem[Knuth et~al.(1989)Knuth, Larrabee, and Roberts]{Knuth89}
Donald~E. Knuth, Tracy~L. Larrabee, and Paul~M. Roberts.
\newblock {\em Mathematical Writing}.
\newblock Mathematical Association of America, Washington, D.C., 1989.
\newblock ISBN 0-88385-063-X.

\bibitem[Leunen(1992)]{VanLeunen92}
Mary Claire~Van Leunen.
\newblock {\em A Handbook for Scholars}.
\newblock Oxford University Press, 1992.

\bibitem[Minton et~al.(1999)Minton, Alto, and Stewart]{Minton99}
Steven Minton, Martha~Del Alto, and Helen Stewart.
\newblock Instructions for formatting jair articles.
\newblock Available electronically via {\tt
  http://www.jair.org/submission-info.html}, 1999.

\end{thebibliography}