Smithsonian Institution. Office of the Secretary & Lewton, F. L. (1912). Rubelzul cotton: New species of Gossypium from Guatemala. [publisher not identified].
Chicago Style (17th ed.) CitationSmithsonian Institution. Office of the Secretary and Frederick L. Lewton. Rubelzul Cotton: New Species of Gossypium from Guatemala. Washington, D.C.: [publisher not identified], 1912.
MLA (9th ed.) CitationSmithsonian Institution. Office of the Secretary and Frederick L. Lewton. Rubelzul Cotton: New Species of Gossypium from Guatemala. [publisher not identified], 1912.
Warning: These citations may not always be 100% accurate.