Smithsonian Institution. Office of the Secretary & Maxon, W. R. (1920). New Selaginellas from Western U.S. [publisher not identified].
Chicago Style (17th ed.) CitationSmithsonian Institution. Office of the Secretary and William R. Maxon. New Selaginellas from Western U.S. Washington, D.C.: [publisher not identified], 1920.
MLA (9th ed.) CitationSmithsonian Institution. Office of the Secretary and William R. Maxon. New Selaginellas from Western U.S. [publisher not identified], 1920.
Warning: These citations may not always be 100% accurate.