Ganos C, Ogrzal T, Schnitzler A, Münchau A (September 2012). "The pathophysiology of echopraxia/echolalia: relevance to Gilles de la Tourette syndrome". Mov. Disord. 27 (10): 1222–9. doi:10.1002/mds.25103. PMID22807284.
Realmuto GM, August GJ (December 1991). "Catatonia in autistic disorder: a sign of comorbidity or variable expression?". J Autism Dev Disord. 21 (4): 517–28. doi:10.1007/BF02206874. PMID1778964.
Ganos C, Ogrzal T, Schnitzler A, Münchau A (September 2012). "The pathophysiology of echopraxia/echolalia: relevance to Gilles de la Tourette syndrome". Mov. Disord. 27 (10): 1222–9. doi:10.1002/mds.25103. PMID22807284.
Realmuto GM, August GJ (December 1991). "Catatonia in autistic disorder: a sign of comorbidity or variable expression?". J Autism Dev Disord. 21 (4): 517–28. doi:10.1007/BF02206874. PMID1778964.