APA (7th ed.) Citation

Bull, Butterfield, & Wight. (1966). Diplomatic investigations: Essays in the theory of international politics. Allen and Unwin.

Chicago Style (17th ed.) Citation

Bull, Butterfield, and Wight. Diplomatic Investigations: Essays in the Theory of International Politics. London: Allen and Unwin, 1966.

MLA (8th ed.) Citation

Bull, et al. Diplomatic Investigations: Essays in the Theory of International Politics. Allen and Unwin, 1966.