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Warren, S.F., Brady, N.C., & Fey, M.E. (2004). Communication and language: Research design and measurement issues. In E. Emerson, C. Hatton, T. Thompson, & T.R. Parmeter (Eds.). The International Handbook of Applied Research in Intellectual Disabilities. (pp. 385-406). West Sussex, England: John Wiley and Sons, Ltd.