Continuity and change in the social competence of children with autism, Down syndrome, and developmental delays

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Reference: 
Sigman, M., Ruskin, E., Arbeile, S., Corona, R., Dissanayake, C., Espinosa, M., et al. (1999). Continuity and change in the social competence of children with autism, Down syndrome, and developmental delays. Monographs of the Society for Research in Child Development, 64(1), 1-114.