1. Diagnostic and statistical manual of mental disorders;American Psychiatric Association,2000
2. Procedural reliability: A rationale and example;Billingsley;Behavioral Assessment,1980
3. Applied behavior analysis;Cooper,2007
4. Using microswitches to teach toy use;Crawford;Journal of Developmental and Physical Disabilities,1993
5. Sensory reinforcement of head turning with nonambulatory, profoundly mentally retarded persons;Dewson;Research in Developmental Disabilities,1987