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  1. William Angus Sinclair (2000). Conditions of Knowing an Essay Towards a Theory of Knowledge.
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  2. William Angus Sinclair (1951). The Conditions of Knowing: An Essay Towards a Theory of Knowledge. Harcourt, Brace.
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  3. William Angus Sinclair (1945). The Traditional Formal Logic. London, Methuen & Co., Ltd..
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  4. William Angus Sinclair (1944). An Introduction to Philosophy. New York [Etc.]Oxford University Press.
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  5. William Angus Sinclair (1919). The Traditional Formal Logic a Short Account for Students. Methuen.
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