Studi utama tentang kebaikan dan kejahatan (atau moralitas) adalah etika, yang memiliki tiga cabang utama: etika normatif tentang bagaimana kita seharusnya berperilaku, etika terapan tentang isu-isu moral tertentu, dan metaetika tentang hakikat moralitas itu sendiri.[5]
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Boyce, Mary (1979). Zoroastrians: Their Religious Beliefs and Practices. London: Routledge/Kegan Paul. Corrected repr. 1984; repr. with new foreword 2001.
Dewey, John. Theory of Valuation. 1948. University of Chicago Press.
Durant, Ariel and W. Durant. The Lessons of History. 1997. MJF Books. (p72)
Garcia, John David. The Moral Society— A Rational Alternative to Death. 2005. Whitmore Publishing.
Griffin, James. Well-Being: Its Meaning, Measurement and Moral Importance. 1986. Oxford: Oxford University Press.
Hume, David. A Treastise of Human Nature. 2000. Oxford: Oxford University Press.
Hurka, Thomas. Perfectionism. 1993. Oxford: Oxford University Press.
Kant, Immanuel. Groundwork of the Metaphysic of Morals. 1996. Cambridge University Press. Third section, [446]-[447].
Wilson, William McF., and Julian N. Hartt. Farrer's Theodicy. In David Hein and Edward Hugh Henderson (eds), Captured by the Crucified: The Practical Theology of Austin Farrer. New York and London: T & T Clark / Continuum, 2004. ISBN0-567-02510-1