Cita APA (7th ed.)
(1936). Middle Cenozoic Floras of western North America.
Cita Chicago (17th ed.)
Middle Cenozoic Floras of Western North America. Washington, 1936.
Cita MLA (9th ed.)
Middle Cenozoic Floras of Western North America. 1936.
Atenció: Aquestes cites poden no estar 100% correctes.