Britain Looks to Germany: British Opinion and Policy towards Germany since 1945, (O. Wolff, 1965).
Personalities and Policies: Studies in the Formulation of British Foreign Policy in the Twentieth Century, (Longmans, 1965).
Too Serious a Business: European Armed Forces and the Approach to the Second World War, (University of California Press, 1975).
Survey of International Affairs, 1963, (Oxford University Press, 1977).
Succeeding John Bull: America in Britain's Place, 1900-1975: A Study of the Anglo-American Relationship and World Politics in the Context of British and American Foreign-Policy-Making in the Twentieth Century, (Cambridge University Press, 1984).
How War Came: the Immediate Origins of the Second World War, 1938-1939, (Heinemann, 1989).
Studies in International History: Essays Presented to W. Norton Medlicott, co-edited with K. Bourne, (Longmans, 1967).
Current British Foreign Policy: Documents, Statements, Speeches, co-edited with James Mayall, (T. Smith, 1971).
British Documents on Foreign Affairs: Reports and Papers from the Foreign Office Confidential Print, co-edited with Kenneth Bourne, (University Publications of America, 1984-1998).
Argentina between the Great Powers, 1939-46, co-edited with Guido Di Tella, (Macmillan, 1989).