APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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

Let op: Deze citaties zijn niet altijd 100% accuraat.