APA (7e ed.) Bronvermelding

Não informado. (2000). University of Iowa studies in social science. University of Iowa.

Chicago (17e ed.) Bronvermelding

Não informado. University of Iowa Studies in Social Science. Iowa City, Iowa: University of Iowa, 2000.

MLA (8e ed.) Bronvermelding

Não informado. University of Iowa Studies in Social Science. University of Iowa, 2000.

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