Todd May, “Moral Individualism, Moral Relationism, and Obligations to Non-human Animals,” Journal of Applied Philosophy, 31 (2014) : 154+156-158+160-161+164
Peter Singer, “All Animals are Equal,” in Michael E. Zimmerman, J. Baird Callicott, George Sessions, Karen J. Warren, and John Clark (eds), Environmental Philosophy: From Animal Rights to Radical Ecology, 3rd ed. (New Jersey: Prentice-Hall, 2001), p. 31.
Tom Regan, “Animal Rights, Human Wrongs,” in Michael E. Zimmerman, J. Baird Callicott, George Sessions, Karen J. Warren, and John Clark (eds.), Environmental Philosophy: From Animal Rights to Radical Ecology, 3rd ed. (New Jersey: Prentice-Hall, 2001), p. 44-45.
Elizabeth Anderson, “Animal Rights and the Values of Nonhuman Life,” in Cass R. Sunstein and Martha C. Nussbaum (eds.), Animal Rights: Current Debates and New Directions (New York: Oxford University Press, 2004), p. 288.