Cita APA (7a ed.)

Não informado. (1919). University of Iowa Studies in Natural History. University of Iowa.

Cita Chicago Style (17a ed.)

Não informado. University of Iowa Studies in Natural History. Iowa City, Iowa: University of Iowa, 1919.

Cita MLA (8a ed.)

Não informado. University of Iowa Studies in Natural History. University of Iowa, 1919.

Precaución: Estas citas no son 100% exactas.