Tinsley, Matthew R., and Michael S. Fanselow. "Fear." The Behavior of the Laboratory Rat: A Handbook with Tests. : Oxford University Press, 2004-09-30. Oxford Scholarship Online. 2009-05-01. Date Accessed 26 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195162851.001.0001/acprof-9780195162851-chapter-39>.
Tinsley, M., & Fanselow, M.(2004-09-30). Fear. In The Behavior of the Laboratory Rat: A Handbook with Tests. : Oxford University Press. Retrieved 26 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195162851.001.0001/acprof-9780195162851-chapter-39.
Tinsley, Matthew R., and Michael S. Fanselow. "Fear." In The Behavior of the Laboratory Rat: A Handbook with Tests. : Oxford University Press, 2004-09-30. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195162851.001.0001/acprof-9780195162851-chapter-39.
Tinsley MR, Fanselow MS. Fear. In: Whishaw IQ, Kolb B. The Behavior of the Laboratory Rat: A Handbook with Tests. Oxford University Press; 2004. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195162851.001.0001/acprof-9780195162851-chapter-39. Accessed May 26, 2013.