APA (7e ed.) Bronvermelding

Hudson, J. C. (1972). Geographical diffusion theory. Department of Geography,Northwestern University.

Chicago (17e ed.) Bronvermelding

Hudson, John C. Geographical Diffusion Theory. Evanston, Illinois: Department of Geography,Northwestern University, 1972.

MLA (9e ed.) Bronvermelding

Hudson, John C. Geographical Diffusion Theory. Department of Geography,Northwestern University, 1972.

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