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Westbrook, L.E., Silver, E.J., and Stein, R. E. K. (1998). Implications for estimates of disability in children: a comparison of definitional components. Pediatrics 101(6):1025–1030.

WHO (World Health Organization) (2001). International Classification of Functioning, Disability and Health. Geneva, Switzerland: World Health Organization.


Zigler, E. (1969). Developmental versus difference theories of retardation and the problem of motivation. American Journal of Mental Deficiency 73:536–556.



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