APA (7th ed.) Citation

Smithsonian Institution. (1913). Studies of tropical American ferns, No. 4. GPO.

Chicago Style (17th ed.) Citation

Smithsonian Institution. Studies of Tropical American Ferns, No. 4. [Washington]: GPO, 1913.

MLA (9th ed.) Citation

Smithsonian Institution. Studies of Tropical American Ferns, No. 4. GPO, 1913.

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