APA (7th ed.) Citation

De Leon, H. S. (1973). Textbook on the new Philippine constitution. Rex Book Store.

Chicago Style (17th ed.) Citation

De Leon, Hector S. Textbook on the New Philippine Constitution. Manila: Rex Book Store, 1973.

MLA (9th ed.) Citation

De Leon, Hector S. Textbook on the New Philippine Constitution. Rex Book Store, 1973.