Παραπομπή σε μορφή APA (7η εκδ.)

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.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Gregor, 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.

Παραπομπή σε μορφή MLA (9th εκδ.)

Gregor, Mary J. Laws of Freedom: A Study of Kant's Method of Applying the Categorical Imperative in the Metaphysik Der Sitten. Barnes & Noble, 1963.