Wenk, Gary L. "Simple Molecules That Turn You On and Off." Your Brain on Food: How Chemicals Control Your Thoughts and Feelings. : Oxford University Press, 2010-07-01. Oxford Scholarship Online. 2010-09-01. Date Accessed 23 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195388541.001.0001/acprof-9780195388541-chapter-006>.
Wenk, G.(2010-07-01). Simple Molecules That Turn You On and Off. In Your Brain on Food: How Chemicals Control Your Thoughts and Feelings. : Oxford University Press. Retrieved 23 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195388541.001.0001/acprof-9780195388541-chapter-006.
Wenk, Gary L. "Simple Molecules That Turn You On and Off." In Your Brain on Food: How Chemicals Control Your Thoughts and Feelings. : Oxford University Press, 2010-07-01. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195388541.001.0001/acprof-9780195388541-chapter-006.
Wenk GL. Simple Molecules That Turn You On and Off. In: Wenk G. Your Brain on Food: How Chemicals Control Your Thoughts and Feelings. Oxford University Press; 2010. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195388541.001.0001/acprof-9780195388541-chapter-006. Accessed May 23, 2013.