Παραπομπή σε μορφή APA (7η εκδ.)

Natividad, C. M. (1977). Am alternative method of studying conic sections [microform]. Photoduplication Service. University of the Philippines Library.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Natividad, Caridad Macaranas. Am Alternative Method of Studying Conic Sections [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.

Παραπομπή σε μορφή MLA (9th εκδ.)

Natividad, Caridad Macaranas. Am Alternative Method of Studying Conic Sections [microform]. Photoduplication Service. University of the Philippines Library, 1977.