APA (7th ed.) Citation

Evans, A. W. (1930). Three species of Scapania from western North America ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Evans, Alexander W. Three Species of Scapania from Western North America. [Sonderdr.]. 1930.

MLA (9th ed.) Citation

Evans, Alexander W. Three Species of Scapania from Western North America. [Sonderdr.]. 1930.

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