Student-Use Products under Development by the Instructional Media Production Project for Severely Handicapped Students

Accreditation Council for Services for Mentally Retarded and Other Developmentally Disabled Persons. Washington, DC. 1981.

Sielzer-Azaroff B. Mayer R. Applying behavior-analysis with children and youth. New York, Holt, Rinehard and Winston, 1977.