Butterfield, H., & Wight, M. (1968). Diplomatic investigations; essays in the theory of international politics. Harvard University Press.
Chicago-viite (17. p.)Butterfield, Herbert, ja Martin Wight. Diplomatic Investigations; Essays in the Theory of International Politics. Cambridge, MA: Harvard University Press, 1968.
MLA-viite (9. p.)Butterfield, Herbert, ja Martin Wight. Diplomatic Investigations; Essays in the Theory of International Politics. Harvard University Press, 1968.
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