International Relations: A Political Dictionary (Ref. JX 1226 .P 55 1995)
Encyclopedia of the United Nations and International Agreements. (Ref. KZ 4968 .O84 2003)
Princeton Encyclopedia of the World Economy. (Ref. HF 1373 .P75 2009; also available online)
Dictionary of American Foreign Affairs. (Ref. E 183.7 .F58 1993)
Yearbook of the United Nations. (Ref. JX 1977 .A37 Y4)
Encyclopedia of American Foreign Policy. (Ref. JX 1407 .E53; 2002 available online)
Greenwood Encyclopedia of international Relations
Routledge Encyclopedia of International Political Economy
The WWW Virtual Affairs Library: International Affairs - Covers media, topics, countries and organizations.
International Relations - Alpha arrangement of hundreds of sites.
Intute International Relations - Alpha arrangement of several hundred sites in international relations.
BUBL Link International Relations - Covers a variety of topics such as the Noam Chomsky archive, water and conflict, NATO at 50.
IR Theory Web Site - Opportunity for discussion and the knowledge base gives overviews of various theories.