Castillo, L. L. (1997). Mathematics for general education: A cooperative venture of the U.P. Diliman GE Mathematics Committee (Revised edition.). University of the Philppines, GE Mathematics Committee.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Castillo, Leticia L. Mathematics for General Education: A Cooperative Venture of the U.P. Diliman GE Mathematics Committee. Revised edition. Quezon City: University of the Philppines, GE Mathematics Committee, 1997.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Castillo, Leticia L. Mathematics for General Education: A Cooperative Venture of the U.P. Diliman GE Mathematics Committee. Revised edition. University of the Philppines, GE Mathematics Committee, 1997.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.