APA (7th ed.) Citation

Smithsonian Institution. Office of the Secretary & Christ, H. (1911). On Psomiocarpa, neglected genus of ferns. [publisher not identified].

Chicago Style (17th ed.) Citation

Smithsonian Institution. Office of the Secretary and H. Christ. On Psomiocarpa, Neglected Genus of Ferns. Washington, D.C.: [publisher not identified], 1911.

MLA (9th ed.) Citation

Smithsonian Institution. Office of the Secretary and H. Christ. On Psomiocarpa, Neglected Genus of Ferns. [publisher not identified], 1911.