Corpuz, F. N. (1975). Age-grade census in relation to grade-progress of the elementary school pupils in the Division of Isabela, 1965-1966 [microform]. Photoduplication Service, University of the Philippines Library.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Corpuz, Federico Nicolas. Age-grade Census in Relation to Grade-progress of the Elementary School Pupils in the Division of Isabela, 1965-1966 [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1975.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Corpuz, Federico Nicolas. Age-grade Census in Relation to Grade-progress of the Elementary School Pupils in the Division of Isabela, 1965-1966 [microform]. Photoduplication Service, University of the Philippines Library, 1975.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.