Wallerstein, I. M. (1991). Geopolitics and geoculture: Essays on the changing world-system. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Wallerstein, Immanuel Maurice. Geopolitics and Geoculture: Essays on the Changing World-system. Cambridge: Cambridge University Press, 1991.
Lua MLA (9ú heag.)Wallerstein, Immanuel Maurice. Geopolitics and Geoculture: Essays on the Changing World-system. Cambridge University Press, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.