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The book of Edward Hallett Carr, one of the main representatives of realism.
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An ontological dispute between liberalism and realism.
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The book of Hans Morgenthau, one of the main representatives of realism.
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The emergence of the realist school of thought in the discipline. This was based on two books, on 'The Twenty Years' Crisis' (by Carr) and 'Politics Among Nations' (by Morgenthau).
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An epistemological debate between behavioralism and traditionalism.
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An ontological dispute between neorealism and neoliberalism, also at the same time both theories had to defend themselves against critical theories (most importantly against neo-Marxism)
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An epistemological debate between the rational or positivist approaches (liberalism, realism and Marxism) and constructivism.
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The book of Alexander Wendt, who was one of the most important representatives of the constructivist approach.