Gardner, John. "Justifications and Reasons." Harm and Culpability. : Oxford University Press, 1996-08-22. Oxford Scholarship Online. 2012-03-22. Date Accessed 22 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198260578.001.0001/acprof-9780198260578-chapter-005>.
Gardner, J.(1996-08-22). Justifications and Reasons. In Harm and Culpability. : Oxford University Press. Retrieved 22 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198260578.001.0001/acprof-9780198260578-chapter-005.
Gardner, John. "Justifications and Reasons." In Harm and Culpability. : Oxford University Press, 1996-08-22. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198260578.001.0001/acprof-9780198260578-chapter-005.
Gardner J. Justifications and Reasons. In: Simester AP, Smith ATH. Harm and Culpability. Oxford University Press; 1996. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198260578.001.0001/acprof-9780198260578-chapter-005. Accessed May 22, 2013.