APA

Smithsonian Institution Press, . (1918). Annual Report : Smithsonian Institution. Washington: Smithsonian Institution Press.

Chicago

Smithsonian Institution Press, . 1918. Annual Report : Smithsonian Institution. Washington: Smithsonian Institution Press.

Harvard

Smithsonian Institution Press, . (1918). Annual Report : Smithsonian Institution. Washington: Smithsonian Institution Press.

MLA

Smithsonian Institution Press, . Annual Report : Smithsonian Institution. Washington: Smithsonian Institution Press. 1918.