APA (7e ed.) Bronvermelding

Não informado. (1925). Economic Geography. Clark University.

Chicago (17e ed.) Bronvermelding

Não informado. Economic Geography. Worcester, Mass: Clark University, 1925.

MLA (8e ed.) Bronvermelding

Não informado. Economic Geography. Clark University, 1925.

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