Smithsonian Institution. Office of the Secretary & Christensen, C. (1916). Maxonia, new genus of tropical American ferns. [publisher not identified].
Chicago Style (17th ed.) CitationSmithsonian Institution. Office of the Secretary and Carl Christensen. Maxonia, New Genus of Tropical American Ferns. Washington, D.C.: [publisher not identified], 1916.
MLA (9th ed.) CitationSmithsonian Institution. Office of the Secretary and Carl Christensen. Maxonia, New Genus of Tropical American Ferns. [publisher not identified], 1916.
Warning: These citations may not always be 100% accurate.