J. J. А. Van Berkum et al, «Right or Wrong? The Brain’s Fast Response to Morally Objectional Statements,» Psychological Science 20 (2009): 1092-99.

Marc D. Hauser, Moral Minds: The Nature of Right and Wrong (New York: Harper Perennial, 2006), 60-61.

Jonathan Haidt and Craig Joseph, «The Moral Mind: How 5 Sets of Innate Moral Intuitions Guide the Development of Many Culture-Specific Virtues, and Perhaps Even Modules,» in The Innate Mind, eds. P. Carruthers, S. Laurence, and S. Stich (New York: Oxford, 2007), 367-91, and Jonathan Haidt and Jesse Graham, «When Morality Opposes Justice: Conservatives Have Moral Intuitions That Liberals May Not Recognize,» Social Science Research 20, no. 1 (March 2007): 98-116.