Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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