ScienceDirect (Online service), Institute for Research into Mental Retardation, Clarke, A. D. B., & Lewis, M. M. (1972). Learning, speech and thought in the mentally retarded. Butterworths for the Institute for Research into Mental Retardation.
Chicago Style (17th ed.) CitationScienceDirect (Online service), Institute for Research into Mental Retardation, A. D. B. Clarke, and M. M. Lewis. Learning, Speech and Thought in the Mentally Retarded. London: Butterworths for the Institute for Research into Mental Retardation, 1972.
MLA (9th ed.) CitationScienceDirect (Online service), et al. Learning, Speech and Thought in the Mentally Retarded. Butterworths for the Institute for Research into Mental Retardation, 1972.
Warning: These citations may not always be 100% accurate.