APA-referens (7:e uppl.)

Oppenfeld, H. v., Oppenfeld, J. v., Sandoval, P. R., & Sta. Iglesia, J. C. (1957). Farm management land use and tenancy in the Philippines. [s.n.].

Chicago-referens (17:e uppl.)

Oppenfeld, Horst von, Judith von Oppenfeld, P. R. Sandoval, och J. C. Sta. Iglesia. Farm Management Land Use and Tenancy in the Philippines. College, Laguna: [s.n.], 1957.

MLA-referens (9:e uppl.)

Oppenfeld, Horst von, et al. Farm Management Land Use and Tenancy in the Philippines. [s.n.], 1957.