Gadow KD, Sverd J. Attention deficit hyperactivity disorder, chronic tic disorder, and methylphenidate. Adv Neurol. 2006;99:197–207. PMID 16536367 Consultato il 12 febbraio 2011
^ Gadow KD, Sverd J. Attention deficit hyperactivity disorder, chronic tic disorder, and methylphenidate. Adv Neurol. 2006;99:197–207. PMID 16536367. Consultato il 14 febbraio 2011
Shapiro AK, Shapiro E (March 1968). "Treatment of Gilles de la Tourette's Syndrome with haloperidol". Br J Psychiatry 114 (508): 345–50. doi:10.1192/bjp.114.508.345. PMID 4384341. Consultato il 12 febbraio 2011