Machery, Edouard. "Concepts in Philosophy." Doing without Concepts. : Oxford University Press, 2009-03-19. Oxford Scholarship Online. 2009-05-01. Date Accessed 21 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195306880.001.0001/acprof-9780195306880-chapter-3>.
Machery, E.(2009-03-19). Concepts in Philosophy. In Doing without Concepts. : Oxford University Press. Retrieved 21 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195306880.001.0001/acprof-9780195306880-chapter-3.
Machery, Edouard. "Concepts in Philosophy." In Doing without Concepts. : Oxford University Press, 2009-03-19. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195306880.001.0001/acprof-9780195306880-chapter-3.
Machery E. Concepts in Philosophy. In: Machery E. Doing without Concepts. Oxford University Press; 2009. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195306880.001.0001/acprof-9780195306880-chapter-3. Accessed May 21, 2013.