BradtkeL. M., KirkpatrickW. J.Jr., RosenblattK. P.Intensive play—A technique for building affective behaviors in profoundly mentally retarded young children. Education and Training of the Mentally Retarded, 1972, 7, 8–13.
2.
CortazzoA., BradtkeL. M., KirkpatrickW. J.Jr., RosenblattK. P.Innovations to improve care in an institution for the mentally retarded. Children's Magazine, 1971, March.
3.
PiagetJ.The origins of intelligence in children. CookMargaret, Translator. New York: International Universities Press, 1965.
