SmithD. D., SmithJ. O., & EdgarE. (1976). A prototypic model for developing instructional materials for the severely handicapped. In HaringN. G. & BrownL. (Eds.), Teaching the severely handicapped: A yearly publication of the American Association for the Education of the Severely/Profoundly Handicapped (Vol. 1). New York: Grune & Stratton.
6.
SmithD. D., SmithJ. O., & HaringN. G. (1974). The shoe tie program. Experimental Edition. Experimental Education Unit, Child Development and Mental Retardation Center, University of Washington.