More links and websites
A government ministry site with information about New Zealand’s international relations.
More suggestions and sources
McKinnon, Malcolm. Independence and foreign policy: New Zealand in the world since 1935. Auckland: Auckland University Press, 1993.
Peren, Roger, ed. Japan and New Zealand: 150 years. Palmerston North: Massey University and Historical Branch, Dept. of Internal affairs, 1999.
McIntosh, Alister, and others. New Zealand in world affairs. 4 vols. Wellington: New Zealand Institute of International Affairs, 1977–2006.
Singleton, John and Paul L. Robertson. Economic relations between Britain and Australasia, 1945–1970. Basingstoke, UK: Palgrave, 2002.