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The reference collection is a great place to begin your research. These short relevant articles will give the basic understanding you need to formulate a good research question. Try searching for nuclear disarmament, nuclear nonproliferation, or another related concept within one or more of the following reference works.
"This innovative, multivolume encyclopedia charts the interdisciplinary field of Peace Studies, offering a comprehensive survey of the full range of historical, political, theoretical and philosophical issues relating to peace and conflict."
This online handbook "provides a cutting-edge and transdisciplinary overview of the main issues, debates, state-of-the-art methods, and key concepts in peace and conflict studies today." (publisher's description)