1. American Association on Intellectual and Developmental Disabilities. (2011). Intellectual disability: definition, classification, and systems of supports (11th ed.). Washington, D.C. : American Association on Intellectual and Developmental Disabilities.
2. Davies, D. K., Stock, S. E., Wehmeyer, M. L. (2002a). Enhancing independent task performance for individuals with mental retardation through use of handheld self-directed visual and audio prompting system. Education and Training in Mental Retardation and Developmental Disabilities, 37 (2), 209-218.
3. Davies, D. K., Stock, S. E., Wehmeyer, M. L. (2002b). Enhancing independent time-management skills in individuals with mental retardation using a Palmtop personal computer. Mental Retardation, 40 (5), 358-365.
4. Davies, D. K., Stock, S. E., Wehmeyer, M. L. (2003). A palmtop computer-based intelligent aid for individuals with intellectual disabilities to increase independant decision making. Research & Pratice for Persons With Severe Disabilities, 28 (4), 182-193.
5. Demers, L., Weiss-Lambrou, R., Ska, B. (2000). Quebec User Evaluation of Satisfaction with assistive Technology. U.S.A. : New York