Sosa, Ernest. "Epistemic Normativity." A Virtue Epistemology: Apt Belief and Reflective Knowledge, Volume I. : Oxford University Press, 2007-06-28. Oxford Scholarship Online. 2007-09-01. Date Accessed 22 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199297023.001.0001/acprof-9780199297023-chapter-4>.
Sosa, E.(2007-06-28). Epistemic Normativity. In A Virtue Epistemology: Apt Belief and Reflective Knowledge, Volume I. : Oxford University Press. Retrieved 22 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199297023.001.0001/acprof-9780199297023-chapter-4.
Sosa, Ernest. "Epistemic Normativity." In A Virtue Epistemology: Apt Belief and Reflective Knowledge, Volume I. : Oxford University Press, 2007-06-28. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199297023.001.0001/acprof-9780199297023-chapter-4.
Sosa E. Epistemic Normativity. In: Sosa E. A Virtue Epistemology: Apt Belief and Reflective Knowledge, Volume I. Oxford University Press; 2007. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199297023.001.0001/acprof-9780199297023-chapter-4. Accessed May 22, 2013.