APA aipamena

De Leon, H. S. (1989). Textbook on the new Philippine constitution (1989 ed.). Rex Book Store.

Chicago Style aipamena

De Leon, Hector S. Textbook on the New Philippine Constitution. 1989 ed. Quezon City, Manila: Rex Book Store, 1989.

MLA aipamena

De Leon, Hector S. Textbook on the New Philippine Constitution. 1989 ed. Rex Book Store, 1989.