APA (7th ed.) Citation

Maxon, W. R. (1902). Notes on american ferns ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Maxon, William R. Notes on American Ferns. [Sonderdr.]. 1902.

MLA (9th ed.) Citation

Maxon, William R. Notes on American Ferns. [Sonderdr.]. 1902.

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