APA (7e ed.) Bronvermelding

Não informado. (1946). Iowa farm science. Iowa State University of Science and Technology, Cooperative Extension Service.

Chicago (17e ed.) Bronvermelding

Não informado. Iowa Farm Science. Ames, Iowa: Iowa State University of Science and Technology, Cooperative Extension Service, 1946.

MLA (8e ed.) Bronvermelding

Não informado. Iowa Farm Science. Iowa State University of Science and Technology, Cooperative Extension Service, 1946.

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