APA (7e ed.) Bronvermelding

(1939). Colorado University Studies. Series in Social Science. University of Colorado Press.

Chicago (17e ed.) Bronvermelding

Colorado University Studies. Series in Social Science. University of Colorado Press, 1939.

MLA (9e ed.) Bronvermelding

Colorado University Studies. Series in Social Science. University of Colorado Press, 1939.

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