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Johnson, L., & Wirtz, J. (2010-03-12). The Sources and Methods of Intelligence Studies. In The Oxford Handbook of National Security Intelligence. : Oxford University Press. Retrieved 14 Jul. 2020, from https://www.oxfordhandbooks.com/view/10.1093/oxfordhb/9780195375886.001.0001/oxfordhb-9780195375886-e-0004.