References
^ Ellington, James W.; Kant, Immanuel (2014). Ethical Philosophy : Grounding for the Metaphysics of Morals and Metaphysical Principles of Virtue, Hackett Pub Co Inc. BiggerBooks. ISBN 9780872203204 (revised Nov 2023)^ (2013). Ethical Philosophy : Grounding for the Metaphysics of Morals and Metaphysical Principles of Virtue ECampus. ISBN 9780872203204 (revised Aug 2015)
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