Use the following databases to search for research papers in many forms: journal articles, book chapters, government reports, conference proceedings, etc.
International Security & Counter Terrorism Reference Center
General crime analysis and criminal justice from an international perspective.
National Criminal Justice Reference Service (NCJRS) * - info
Contains abstracts describing over 200,000 resources, including “statistics, research findings, program descriptions, congressional hearing transcripts, and training materials.”
Digital National Security Archive
This collection of historical documents makes up the biggest single collection of declassified government documents on national security available.
Center for the Study and Prevention of Violence (CSPV)*
Includes scholarly, practical, and organizational material for any aspect of violence and society.
The Brookings Institute -- Quality research on all aspects of public policy.
Carnegie Endowment for International Peace -- This global think tank is devoted to international cooperation.
Center for Biosecurity -- This University of Pittsburgh Medical Center nonprofit provides information on and access to research on biological terrorism, epidemics, and technological and medical advances, as well as public health.
Center for Nonproliferation Studies -- The James Martin Center for Nonproliferation Studies is the largest nongovernmental body in the U.S. devoted to researching nonproliferation issues.
Center for Strategic and International Studies -- The Center researches, discusses, and proposes solutions to questions about the U.S.'s place in the world. Some publications listed won't be freely accessible through the site, but the majority are.
Federation of American Scientists -- The FAS is a nonprofit organization comprised of scientists dedicated to educating and informing the public on how good public policy can increase the benefits of new scientific knowledge, specifically in the field of biosecurity, earth systems, educational technologies, and strategic security.
Homeland Security Studies & Analysis Institute -- This ANSER-operated nonprofit, public service research organization examines various challenges to national security and provides research support to the U.S. Department of Homeland Security.
International Crisis Group -- A nonprofit organization dedicated to preventing and resolving deadly conflict throughout the world.
International Institute for Strategic Studies -- A British think tank specializing in international political-military conflict and offering original research in the form of reports, online databases, conferences, lectures, and working groups. Some free access to older material.
International Relations Security Network -- This online project of the Center for Security Studies at the Swiss Federal Institute of Technology provides free, fulltext access to a large digital library that includes research reports, primary sources, and the Security Watch newsletter, as well as access to many free online courses.
National Security Archive -- Provides free, online access to declassified documents and a range of other government records on issues including U.S. national security, foreign policy, diplomatic and military history, and intelligence policy.
Strategic Studies Institute -- An institute of the U.S. Army War College, the SSI provides strategic research and analysis on issues of national security for the U.S. Army.