APA (7e ed.) Bronvermelding

Não informado. (2001). Bulletin. Iowa Agricultural and Home Economics Experiment Station.

Chicago (17e ed.) Bronvermelding

Não informado. Bulletin. Ames, Iowa: Iowa Agricultural and Home Economics Experiment Station, 2001.

MLA (8e ed.) Bronvermelding

Não informado. Bulletin. Iowa Agricultural and Home Economics Experiment Station, 2001.

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