Centers for Disease Control and Prevention Website. National Center on Birth Defects and Developmental Disabilities. Learn the Signs. Act Early. Important Milestones: Your Child at Two Years. Available at: http://www.cdc.gov/ncbddd/actearly/milestones/milestones-2yr.html. Accessed August 8, 2011.
First Signs Website. Hallmark Developmental Milestones. Available at: http://www.firstsigns.org/healthydev/milestones.htm. Accessed: August 8, 2011.
Howlin P, Asgharian A. The diagnosis of autism and Asperger syndrome: findings from a survey of 770 families. Dev Med Child Neurol. 1999;41:834-9.
Johnson CP, Myers SM. Council on Children with Disabilities. Identification and evaluation of children with autism spectrum disorders. Pediatrics. 2007;120(5):1183-215.
Lord C, Luyster R, Guthrie W, Pickles A. Patterns of developmental trajectories in toddlers with autism spectrum disorder. Journal of Consulting and Clinical Psychology. 2012;80(3):477-489.
Mandell DS, Maytali MN, Zubritsky CD. Factors associated with age of diagnosis among children with autism spectrum disorder. Pediatrics. 2005;116(6):1480-6.
Martinez-Pedraza F.d.L., Carter A. Autism spectrum disorders in young children. Child Adolesc PsychiatrClin N Am. 2009;18:645-63.
Rogers SJ. Developmental regression in autism spectrum disorders. Ment Retard Dev Disabil Res Rev. 2004;10:139-43.
Steiner AM, Goldsmith TR, Snow AV, Chawarska K. Practitioner’s guide to assessment of autism spectrum disorders in infants and toddlers. Journal of Autism and Developmental Disorders. 2012;42:1183-1196.