APA (7th ed.) Zitazioa
Kearns, G. (2009). Geopolitics and empire: The legacy of Halford Mackinder. Oxford University Press.
Chicago Style (17th ed.) Zitazioa
Kearns, Gerard. Geopolitics and Empire: The Legacy of Halford Mackinder. New York, N.Y.: Oxford University Press, 2009.
MLA (9th ed.) Zitazioa
Kearns, Gerard. Geopolitics and Empire: The Legacy of Halford Mackinder. Oxford University Press, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.