De Leon, H. S. (1973). Textbook on the new Philippine constitution. Rex Book Store.
芝加哥风格引文De Leon, Hector S. Textbook on the New Philippine Constitution. Manila: Rex Book Store, 1973.
MLA引文De Leon, Hector S. Textbook on the New Philippine Constitution. Rex Book Store, 1973.
警告：这些引文格式不一定是100％准确.