Sources:
Turnbull, A. P., Turnbull, H. R., & Wehmeyer, M. L. (2010). Exceptional lives: Special education in today's schools. Upper Saddle River, N.J: Merrill
Turnbull, A. P., Turnbull, H. R., & Wehmeyer, M. L. (2010). Exceptional lives: Special education in today's schools. Upper Saddle River, N.J: Merrill