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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)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.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)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.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.