De Leon, H. S., & De Leon, H. M. J. (2014). Comments and cases on obligations and contracts (Sixth edition.). Rex Book Store.
芝加哥风格引文De Leon, Hector S., 与 Hector M. Jr De Leon. Comments and Cases on Obligations and Contracts. Sixth edition. Manila: Rex Book Store, 2014.
MLA引文De Leon, Hector S., 与 Hector M. Jr De Leon. Comments and Cases on Obligations and Contracts. Sixth edition. Rex Book Store, 2014.
警告：这些引文格式不一定是100％准确.