APA (7th ed.) Citation

Smithsonian Institution. (1920). Systematic plant studies, chiefly tropical American. GPO.

Chicago Style (17th ed.) Citation

Smithsonian Institution. Systematic Plant Studies, Chiefly Tropical American. [Washington]: GPO, 1920.

MLA (9th ed.) Citation

Smithsonian Institution. Systematic Plant Studies, Chiefly Tropical American. GPO, 1920.

Warning: These citations may not always be 100% accurate.