Liongson, L. Q. (1982). Linear programming cases in the water resources engineering classroom: Formulation and implementation with the linear programming language (LPL) package. Philippine Engineering Journal.
Chicago-referens (17:e uppl.)Liongson, Leonardo Q. "Linear Programming Cases in the Water Resources Engineering Classroom: Formulation and Implementation with the Linear Programming Language (LPL) Package." Philippine Engineering Journal 1982.
MLA-referens (9:e uppl.)Liongson, Leonardo Q. "Linear Programming Cases in the Water Resources Engineering Classroom: Formulation and Implementation with the Linear Programming Language (LPL) Package." Philippine Engineering Journal, 1982.
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