APA (7th ed.) Citation

Maxon, W. R. (1913). Saffordia, a new genus of ferns from Peru. Smithsonian institution.

Chicago Style (17th ed.) Citation

Maxon, William R. Saffordia, a New Genus of Ferns from Peru. City of Washington: Smithsonian institution, 1913.

MLA (9th ed.) Citation

Maxon, William R. Saffordia, a New Genus of Ferns from Peru. Smithsonian institution, 1913.