APA引文

De Leon, H. S. (1977). Handbook on obligations and contracts. s.n.].

Chicago Style (17th ed.) Citation

De Leon, Hector S. Handbook on Obligations and Contracts. [S.l: s.n.], 1977.

MLA引文

De Leon, Hector S. Handbook on Obligations and Contracts. s.n.], 1977.

警告：這些引文格式不一定是100％准確.