1. Bull, Hedley. 1966a. International Theory: The Case for a Classical Approach. World Politics 18 (3): 361–377. Also in 1969 Contending Approaches to International Politics, ed. Klaus Knorr and James N. Rosenau, 20–38. Princeton: Princeton University Press.
2. ———. 1966b. The Grotian Conception of International Society. In Diplomatic Investigations: Essays in the Theory of International Politics, ed. Herbert Butterfield and Martin Wight, 51–73. London: Allen and Unwin.
3. ———. 1977. The Anarchical Society: A Study of Order in World Politics. London: Macmillan.
4. ———. 1984. Intervention in World Politics. Oxford: Oxford University Press.
5. Bull, Hedley, and Adam Watson. 1984. Introduction. In The Expansion of International Society, ed. H. Bull and A. Watson, 1–9. Oxford: Clarendon Press.