Putting Logic in its Place: Formal Constraints on Rational Belief. : Oxford University Press, 2004-11-04. Oxford Scholarship Online. 2005-07-14. Date Accessed 20 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/0199263256.001.0001/acprof-9780199263257>.
(2004-11-04). Putting Logic in its Place: Formal Constraints on Rational Belief. : Oxford University Press. Retrieved 20 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/0199263256.001.0001/acprof-9780199263257.
Putting Logic in its Place: Formal Constraints on Rational Belief. : Oxford University Press, 2004-11-04. http://www.oxfordscholarship.com/view/10.1093/0199263256.001.0001/acprof-9780199263257.
Christensen D. Putting Logic in its Place: Formal Constraints on Rational Belief. Oxford University Press; 2004. http://www.oxfordscholarship.com/view/10.1093/0199263256.001.0001/acprof-9780199263257. Accessed May 20, 2013.