The Ethics of Capital Punishment: A Philosophical Investigation of Evil and its Consequences. : Oxford University Press, 2011-12-15. Oxford Scholarship Online. 2012-01-19. Date Accessed 22 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199642182.001.0001/acprof-9780199642182>.
(2011-12-15). The Ethics of Capital Punishment: A Philosophical Investigation of Evil and its Consequences. : Oxford University Press. Retrieved 22 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199642182.001.0001/acprof-9780199642182.
The Ethics of Capital Punishment: A Philosophical Investigation of Evil and its Consequences. : Oxford University Press, 2011-12-15. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199642182.001.0001/acprof-9780199642182.
Kramer MH. The Ethics of Capital Punishment: A Philosophical Investigation of Evil and its Consequences. Oxford University Press; 2011. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199642182.001.0001/acprof-9780199642182. Accessed May 22, 2013.