1. Abery, B. H., & Stancliffe, R. J. (2003). A tripartite theory of self-determination. In M. L. Wehmeyer, B. H. Abery, D. E. Mithaug, & R. J. Stancliffe (Eds.), Theory in self-determination: Foundations for educational practice (pp. 43–78). Springfield, IL: Charles C Thomas Publisher.
2. Atchley, R. C. (1989). A continuity theory of normal aging. The Gerontologist, 29, 183–190.
3. Baltes, P. B., & Baltes, M. M. (1990). Psychological perspectives on successful aging: The model of selective optimization with compensation. Successful Aging: Perspectives from the Behavioral Sciences, 1, 1–34.
4. Beadle-Brown, J., Hutchinson, A., & Whelton, B. (2012). Person-centred active support – Increasing choice, promoting independence and reducing challenging behaviour. Journal of Applied Research in Intellectual Disabilities, 25(4), 291–307.
5. Brown, I., & Brown, R. I. (2009). Choice as an aspect of quality of life for people with intellectual disabilities. Journal of Policy and Practice in Intellectual Disabilities, 6(1), 11–18.