Smithsonian Institution. Office of the Secretary & Maxon, W. R. (1913). Safforida, new genus of ferns from Peru. [publisher not identified].
Chicago Style (17th ed.) CitationSmithsonian Institution. Office of the Secretary and William R. Maxon. Safforida, New Genus of Ferns from Peru. Washington, D.C.: [publisher not identified], 1913.
MLA (9th ed.) CitationSmithsonian Institution. Office of the Secretary and William R. Maxon. Safforida, New Genus of Ferns from Peru. [publisher not identified], 1913.
Warning: These citations may not always be 100% accurate.