James, P. E., Martin, G. J., & James, E. W. (1981). All possible worlds: A history of geographical ideas (Second edition.). Wiley.
Dyfyniad Arddull ChicagoJames, Preston Everett, Geoffrey J. Martin, and Eileen W. James. All Possible Worlds: A History of Geographical Ideas. Second edition. New York: Wiley, 1981.
Dyfyniad MLAJames, Preston Everett, et al. All Possible Worlds: A History of Geographical Ideas. Second edition. Wiley, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.