APA (7th ed.) Citation

Maxon, W. R. (1908). Studies of tropical American ferns. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

Maxon, William R. Studies of Tropical American Ferns. Washington?: U.S. Government Printing Office, 1908.

MLA (9th ed.) Citation

Maxon, William R. Studies of Tropical American Ferns. U.S. Government Printing Office, 1908.

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