1. Teter CJ, McCabe SE, Boyd CJ, Guthrie SK. Illicit methylphenidate use in an undergraduate student sample: prevalence and risk factors. Pharmacotherapy. 2003;23:609-617.
2. Moore S. Behavioral inhibition, self-regulation of motivation, and working memory in children with attention deficit hyperactivity disorder. Dev Neuropsychol. 2002;21:117-140.
3. Safer DJ, Zito JM. Increased methylphenidate usage for attention deficit disorder in the 1990s. Pediatrics. 1996;98:1084-1089.
4. Diller L. Running on Ritalin. New York: Bantam Doubleday Dell; 1998.
5. Brown RT, Freeman WS, Perrin JM, et al. Prevalence and assessment of attention deficit/hyperactivity disorder in primary care settings. Pediatrics. 2001;107:43-53.