APA (7e ed.) Bronvermelding

Torres, J. P. (1996). Obligations and contracts (with introduction to law) (1996 ed.). Rex Book Store.

Chicago (17e ed.) Bronvermelding

Torres, Justo P. Obligations and Contracts (with Introduction to Law). 1996 ed. Manila: Rex Book Store, 1996.

MLA (9e ed.) Bronvermelding

Torres, Justo P. Obligations and Contracts (with Introduction to Law). 1996 ed. Rex Book Store, 1996.