Cita APA (7th ed.)

De Leon, H. S. (1989). The law on obligations and contracts (1989 rev. ed.). Published & distributed by Rex Book Store.

Cita Chicago (17th ed.)

De Leon, Hector S. The Law on Obligations and Contracts. 1989 rev. ed. Manila, Philippines: Published & distributed by Rex Book Store, 1989.

Cita MLA (9th ed.)

De Leon, Hector S. The Law on Obligations and Contracts. 1989 rev. ed. Published & distributed by Rex Book Store, 1989.