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Walker, H., Calkins, C., Wehmeyer, M., Walker, L., Bacon, A., Palmer, S., Jesien, G., Nygren, M., Heller, T., Gotto, G., Abery, B., & Johnson, D. R. (2011). A social-ecological approach to self-determination. Exceptionality, Special Issue: Promoting Self-Determination, 19(1), 6-18. - Special Issue: Promoting Self-Determination