Não informado. (2011). Education and Training in Developmental Disabilities. Council for Exceptional Children, Division on Developmental Disabilities.
Lua i Stíl Chicago (17ú heag.)Não informado. Education and Training in Developmental Disabilities. Arlington, Va: Council for Exceptional Children, Division on Developmental Disabilities, 2011.
Lua MLA (8ú heag.)Não informado. Education and Training in Developmental Disabilities. Council for Exceptional Children, Division on Developmental Disabilities, 2011.
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