Holloway, Ralph L. "Toward a synthetic theory of human brain evolution." Origins of the Human Brain. : Oxford University Press, 1996-07-11. Oxford Scholarship Online. 2012-03-22. Date Accessed 20 Jun. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198523901.001.0001/acprof-9780198523901-chapter-3>.
Holloway, R.(1996-07-11). Toward a synthetic theory of human brain evolution. In Origins of the Human Brain. : Oxford University Press. Retrieved 20 Jun. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198523901.001.0001/acprof-9780198523901-chapter-3.
Holloway, Ralph L. "Toward a synthetic theory of human brain evolution." In Origins of the Human Brain. : Oxford University Press, 1996-07-11. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198523901.001.0001/acprof-9780198523901-chapter-3.
Holloway RL. Toward a synthetic theory of human brain evolution. In: Changeux J, Chavaillon J. Origins of the Human Brain. Oxford University Press; 1996. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780198523901.001.0001/acprof-9780198523901-chapter-3. Accessed June 20, 2013.