APA (7th ed.) Zitazioa

James, P. E., & Martin, G. J. (1981). All possible worlds: A history of geographical ideas (2nd ed.). John Wiley & Sons.

Chicago Style (17th ed.) Zitazioa

James, Preston Everett, eta Geoffrey J. Martin. All Possible Worlds: A History of Geographical Ideas. 2nd ed. New York: John Wiley & Sons, 1981.

MLA (9th ed.) Zitazioa

James, Preston Everett, eta Geoffrey J. Martin. All Possible Worlds: A History of Geographical Ideas. 2nd ed. John Wiley & Sons, 1981.