APA-viite (7. p.)

De Leon, H. S., & De Leon, H. M. J. (2019). Comments and cases on obligations and contracts (Seventh edition.). Rex Book Store.

Chicago-viite (17. p.)

De Leon, Hector S., ja Hector M. Jr De Leon. Comments and Cases on Obligations and Contracts. Seventh edition. Manila: Rex Book Store, 2019.

MLA-viite (8. p.)

De Leon, Hector S., ja Hector M. Jr De Leon. Comments and Cases on Obligations and Contracts. Seventh edition. Rex Book Store, 2019.