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Griffiths M, Roach SC, Solomon MS. Fifty key thinkers in international relations [Internet]. London: Routledge; 2009. Available from: https://ebookcentral.proquest.com/lib/brunelu/detail.action?docID=369091
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Dunne T, Kurki M, Smith S, editors. International relations theories: discipline and diversity. Fourth edition. Oxford: Oxford University Press; 2016.