Castillo, J. B. (1979). Some factors affecting achievement in elementary science [microform]. Photoduplication Service. University of the Philippines Library.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Castillo, Jovito B. Some Factors Affecting Achievement in Elementary Science [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1979.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Castillo, Jovito B. Some Factors Affecting Achievement in Elementary Science [microform]. Photoduplication Service. University of the Philippines Library, 1979.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.