Kant, Immanuel. Prolegomena to Any Future Metaphysics. A revision of the Paul Carus translation by James Ellington. Indianapolis: Hackett Publishing Company, 1977.

Russell, Bertrand. A History of Western Philosophy. New York: Simon and Schuster, 1972.

Walsh, W. H. "Immanuel Kant." The Encyclopedia of Philosophy. New York: Collier MacMillan Publishers, 1972.

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