Gregor, M. J. (1963). Laws of freedom: A study of Kant's method of applying the categorical imperative in the Metaphysik der Sitten. Barnes & Noble.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGregor, Mary J. Laws of Freedom: A Study of Kant's Method of Applying the Categorical Imperative in the Metaphysik Der Sitten. New York: Barnes & Noble, 1963.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGregor, Mary J. Laws of Freedom: A Study of Kant's Method of Applying the Categorical Imperative in the Metaphysik Der Sitten. Barnes & Noble, 1963.
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