APA (7th ed.) Citation

Keck, D. D. (1940). Notes on Orthocarpus ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Keck, David D. Notes on Orthocarpus. [Sonderdr.]. 1940.

MLA (9th ed.) Citation

Keck, David D. Notes on Orthocarpus. [Sonderdr.]. 1940.

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