Berman, Mitchell N. "Two Kinds of Retributivism." Philosophical Foundations of Criminal Law. : Oxford University Press, 2011-03-03. Oxford Scholarship Online. 2011-05-01. Date Accessed 21 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199559152.001.0001/acprof-9780199559152-chapter-19>.
Berman, M.(2011-03-03). Two Kinds of Retributivism. In Philosophical Foundations of Criminal Law. : Oxford University Press. Retrieved 21 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199559152.001.0001/acprof-9780199559152-chapter-19.
Berman, Mitchell N. "Two Kinds of Retributivism." In Philosophical Foundations of Criminal Law. : Oxford University Press, 2011-03-03. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199559152.001.0001/acprof-9780199559152-chapter-19.
Berman MN. Two Kinds of Retributivism. In: Duff R, Green S. Philosophical Foundations of Criminal Law. Oxford University Press; 2011. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199559152.001.0001/acprof-9780199559152-chapter-19. Accessed May 21, 2013.