Theories of International Relations: Liberalism - http://www.wadsworth.com/politicalscience_d/special_features/ext/ir/tir/tir_infotrac1_2.html Bibliography of sources on liberal and neoliberal international relations theory.
Taking Preferences Seriously: A Liberal Theory of International Politics - http://www.princeton.edu/~amoravcs/library/preferences.pdf Paper by Andrew Moravcsik attempts to reformulate liberal international relations (IR) theory in a nonideological and nonutopian form appropriate to empirical social science. PDF file.
Virtual War College - Liberalism in International Relations - http://www.geocities.com/virtualwarcollege/ir_liberal.htm This paper focusses on the resurgence of Liberalism in International Relations after the Cold War and a guide as to where to look for further information.