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APA Citation

Popper, K. R., & Popper, K. (2009). The two fundamental problems of the theory of knowledge. Routledge.

Chicago Style Citation

Popper, Karl R., and Karl Popper. The Two Fundamental Problems of the Theory of Knowledge. London: Routledge, 2009.

MLA Citation

Popper, Karl R., and Karl Popper. The Two Fundamental Problems of the Theory of Knowledge. Routledge, 2009.

Harvard Style Citation

Popper, K. R. & Popper, K. 2009. The two fundamental problems of the theory of knowledge. London: Routledge.

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