Hudson, J. C. (1972). Geographical diffusion theory. Department of Geography,Northwestern University.
Citace podle Chicago (17th ed.)Hudson, John C. Geographical Diffusion Theory. Evanston, Illinois: Department of Geography,Northwestern University, 1972.
Citace podle MLA (9th ed.)Hudson, John C. Geographical Diffusion Theory. Department of Geography,Northwestern University, 1972.
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