De Leon, H. S. (1973). Textbook on the new Philippine constitution. Rex Book Store.
Lua i Stíl Chicago (17ú heag.)De Leon, Hector S. Textbook on the New Philippine Constitution. Manila: Rex Book Store, 1973.
Lua MLA (9ú heag.)De Leon, Hector S. Textbook on the New Philippine Constitution. Rex Book Store, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.