Florin, Carla. (2004). "Crazy for Coffee." Psyched for Success. 5 November 2004 Retrieved on 11 May 2008 at http://psychologytoday.com/articles/pto-20.html
Nehlig, a. (Ed.). (2004). Coffee, Tea, Chocolate, and the Brain. Boca Raton, FL: Routledge.
Satel, S. (2006). Is Caffeine Addictive?-a Review of the Literature. American Journal of Drug and Alcohol Abuse, 32(4), 493+.
Crazy for Coffee