Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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