APA (7th ed.) Citation

Smithsonian Institution. (1933). Land shells of genuss Obba from Mindoro Province, P. I. [s.n.].

Chicago Style (17th ed.) Citation

Smithsonian Institution. Land Shells of Genuss Obba from Mindoro Province, P. I. [Washington]: [s.n.], 1933.

MLA (9th ed.) Citation

Smithsonian Institution. Land Shells of Genuss Obba from Mindoro Province, P. I. [s.n.], 1933.