The Metaphysics of Gender. : Oxford University Press, 2011-10-21. Oxford Scholarship Online. 2012-01-19. Date Accessed 22 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199740413.001.0001/acprof-9780199740413>.
(2011-10-21). The Metaphysics of Gender. : Oxford University Press. Retrieved 22 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199740413.001.0001/acprof-9780199740413.
The Metaphysics of Gender. : Oxford University Press, 2011-10-21. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199740413.001.0001/acprof-9780199740413.
Witt C. The Metaphysics of Gender. Oxford University Press; 2011. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199740413.001.0001/acprof-9780199740413. Accessed May 22, 2013.