Agency and Deontic Logic. : Oxford University Press, 2001-02-08. Oxford Scholarship Online. 2003-11-01. Date Accessed 21 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/0195134613.001.0001/acprof-9780195134612>.
(2001-02-08). Agency and Deontic Logic. : Oxford University Press. Retrieved 21 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/0195134613.001.0001/acprof-9780195134612.
Agency and Deontic Logic. : Oxford University Press, 2001-02-08. http://www.oxfordscholarship.com/view/10.1093/0195134613.001.0001/acprof-9780195134612.
Horty JF. Agency and Deontic Logic. Oxford University Press; 2001. http://www.oxfordscholarship.com/view/10.1093/0195134613.001.0001/acprof-9780195134612. Accessed May 21, 2013.