Cita APA (7th ed.)

De Leon, H. S. (1969). The law on obligations and contracts. s.n.

Cita Chicago (17th ed.)

De Leon, Hector S. The Law on Obligations and Contracts. [Manila: s.n, 1969.

Cita MLA (9th ed.)

De Leon, Hector S. The Law on Obligations and Contracts. s.n, 1969.