APA (7th ed.) Citation

De Leon, H. S. (1989). The law on obligations and contracts (1989 ed.). Rex Book Store.

Chicago Style (17th ed.) Citation

De Leon, Hector S. The Law on Obligations and Contracts. 1989 ed. Manila: Rex Book Store, 1989.

MLA (9th ed.) Citation

De Leon, Hector S. The Law on Obligations and Contracts. 1989 ed. Rex Book Store, 1989.

Warning: These citations may not always be 100% accurate.