Butterfield, H., & Wight, M. (1968). Diplomatic investigations; essays in the theory of international politics. Harvard University Press.
Lua i Stíl Chicago (17ú heag.)Butterfield, Herbert, agus Martin Wight. Diplomatic Investigations; Essays in the Theory of International Politics. Cambridge, MA: Harvard University Press, 1968.
Lua MLA (9ú heag.)Butterfield, Herbert, agus Martin Wight. Diplomatic Investigations; Essays in the Theory of International Politics. Harvard University Press, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.