-\bibitem[Fourer, Gay, and Kernighan(November 12, 2002)]{AMPL}
-Fourer, Robert, David~M. Gay, and Brian~W. Kernighan. November 12, 2002.
- \emph{AMPL: A Modeling Language for Mathematical Programming}. 2nd ed.
- Cengage Learning.
+\bibitem[Fourer, Gay, and Kernighan(2002)]{AMPL}
+Fourer, Robert, David~M. Gay, and Brian~W. Kernighan. 2002. \emph{AMPL: A
+ Modeling Language for Mathematical Programming}. 2nd ed. Cengage Learning.