1. American Association on Intellectual and Developmental Disabilities. (2010). Intellectual Disability: Definition, Classification, and Systems of Supports (11th ed.). Washington, DC: Author.
2. Barnes, K. J. (1991). Modification of the physical environment. In C. Christiansen & C. Baum (Eds.), Occupational Therapy: Overcoming Human Performance Deficits (pp. 701–745). Thorofare, NJ: Slack Inc.
3. Barthel, K. A. (2010). A frame of reference for neuro-developmental treatment. In P. Kramer & J. Hinojosa (Eds.), Frames of Reference for Pediatric Occupational Therapy (3rd ed., pp. 187-233).
4. Baum, C. M., & Christiansen, C. H. (2005). Person-environment-occupation-performance: An occupation-based framework for practice. In Occupational Therapy: Performance, Participation, and Well-being (3rd ed.).
5. Canadian Association of Occupational Therapists. (2000). Enabling Occupation: An Occupational Therapy Perspective. Ottawa, ON: CAOT Publications ACE.