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Conversation with Kenneth N. Waltz, cover page
http://globetrotter.berkeley.edu/people3/Waltz/waltz-con0.html
Harry Kreisler interviews Kenneth Waltz on International Relations Theory: February, 2003.
Kenneth Waltz, "The Spread of Nuclear Weapons
http://www.mtholyoke.edu/acad/intrel/waltz1.htm
Published in 1981 in Adelphi Papers, Number 171.
The Six Principles of Political Realism
http://www.mtholyoke.edu/acad/intrel/morg6.htm
Taken from Hans Morgenthau's "Politics Among Nations," this is one of the first systematic explanations of the principles of international relations.
Theories of International Relations - Realism
http://www.wadsworth.com/politicalscience_d/special_features/ext/ir/tir/tir_infotrac1_1.html
Bibliography from the International Relations Resource Center.