APA (7th ed.) Citation

De Leon, H. S., & Lugue, E. E. (1973). Textbook on the new Philippine Constitution (1973 ed.). Rex Book Store.

Chicago Style (17th ed.) Citation

De Leon, Hector S., and Emilio E. Lugue. Textbook on the New Philippine Constitution. 1973 ed. Manila: Rex Book Store, 1973.

MLA (9th ed.) Citation

De Leon, Hector S., and Emilio E. Lugue. Textbook on the New Philippine Constitution. 1973 ed. Rex Book Store, 1973.