Masangkay, N. V. (1977). Perceived values of modern mathematics of selected teachers in the Division Occidental Mindoro [microform]. Photoduplication Service. University of the Philippines Library.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Masangkay, Nicolas Villamar. Perceived Values of Modern Mathematics of Selected Teachers in the Division Occidental Mindoro [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Masangkay, Nicolas Villamar. Perceived Values of Modern Mathematics of Selected Teachers in the Division Occidental Mindoro [microform]. Photoduplication Service. University of the Philippines Library, 1977.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.