Hubel, David H. "Second Group of Deprivation Papers." Brain and Visual Perception: The Story of a 25-year Collaboration. : Oxford University Press, 2004-11-11. Oxford Scholarship Online. 2012-03-22. Date Accessed 20 Jun. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195176186.001.0001/acprof-9780195176186-chapter-22>.
Hubel, D.(2004-11-11). Second Group of Deprivation Papers. In Brain and Visual Perception: The Story of a 25-year Collaboration. : Oxford University Press. Retrieved 20 Jun. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195176186.001.0001/acprof-9780195176186-chapter-22.
Hubel, David H. "Second Group of Deprivation Papers." In Brain and Visual Perception: The Story of a 25-year Collaboration. : Oxford University Press, 2004-11-11. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195176186.001.0001/acprof-9780195176186-chapter-22.
Hubel DH. Second Group of Deprivation Papers. In: HUBEL DH, WIESEL TN. Brain and Visual Perception: The Story of a 25-year Collaboration. Oxford University Press; 2004. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195176186.001.0001/acprof-9780195176186-chapter-22. Accessed June 20, 2013.