Visual Tracking in Deaf-Blind Retarded Preschool Children

Calvert D.R. , Reddell R. C. , Jacobs U. , & Baltzer S. Experiences with preschool deaf-blind children. Exceptional Children, 1972, 38, 415–421.

Friedlander B. Z. , & Knight M. S. Systematic studies of stimulus sensitivity in deaf-blind preschool children. Proceedings of the Fourth International Conference on Deaf-Blind Children, Perkins School for the Blind, Watertown, Massachusetts, August, 1971.