Воспоминания коллеги, работавшего с ним в период убийств: A. Rule, The Stranger Beside Me (Norton, 1980). Анализ, проведенный пионером в области психологического изучения психопатии, см.: R. Hare, Without Conscience: The Disturbing World of the Psychopath among Us (Guildford Press, 1999). Глубокий анализ нашей одержимости серийными убийцами: S. Marshall, «Violent Delights,» Believer, December 22, 2022.

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D. de Quervain et al., «The Neural Basis of Altruistic Punishment,» Science 305 (2004): 1254; B. Knutson, «Behavior. Sweet Revenge?,» Science 305 (2004): 1246; D. Chester & C. DeWall, «The Pleasure of Revenge: Retaliatory Aggression Arises from a Neural Imbalance towards Reward,» Social Cognitive and Affective Neuroscience 11 (2016): 1173; Y. Hu, S. Strang & B. Weber, «Helping or Punishing Strangers: Neural Correlates of Altruistic Decisions as Third-Party and of Its Relation to Empathic Concern,» Frontiers of Behavioral Neuroscience 9 (2015): 24; Baumgartner et al., «Who Initiates Punishment, Who Joins Punishment?»; G. Holstege et al., «Brain Activation during Human Male Ejaculation,» Journal of Neuroscience 23 (2003): 9185.

Вера в свободу воли может быть даже продиктована желанием оправдывать с ее помощью справедливое наказание: C. Clark et al., "Free to Punish: A Motivated Account of Free Will Belief," Journal of Personality and Social Psychology 106 (2014): 541. Противоположное мнение см.: A. Monroe & D. Ysidron, «Not So Motivated after All? Three Replication Attempts and a Theoretical Challenge to a Morally Motivated Belief in Free Will,» Journal of Experimental Psychology: General 150 (2021): e1.