APA (7th ed.) Citation

Steyermark, J. A. (1938). Studies of the American flora. [publisher not identified].

Chicago Style (17th ed.) Citation

Steyermark, Julian A. Studies of the American Flora. [Chicago]: [publisher not identified], 1938.

MLA (9th ed.) Citation

Steyermark, Julian A. Studies of the American Flora. [publisher not identified], 1938.