1. Carr, E. G. (1979). Teaching autistic children to use sign language: Some research issues.Journal of Autism and Developmental Disorders, 2, 345?359.
2. Clarke, S., Remington, B., & Light, P. (1988). The role of referential speech in sign learning by mentally retarded children: A comparison of total communication and sign-alone training.Journal of Applied Behavior Analysis, 21, 419?426.
3. Dube, W. V., & McIlvane, W. J. (1989). Adapting a microcomputer for behavioral evaluation of mentally retarded individuals. In J. A. Mulick & R. F. Antonack (Eds.),Transitions in mental retardation, Vol. 4 (pp. 104?127). Norwood, NJ: Ablex.
4. Fletcher, F. G., Stoddard, L. T., & Sidman, M. (1971). A system for unlimited repetitive presentation of auditory stimuli.Journal of Experimental Child Psychology, 11, 165?169.
5. Fulton, R. T., & Spradlin, J. E. (1975). Conditioning and audiologic assessment. In R. T. Fulton & L. L. Lloyd (Eds.),Auditory assessment of the difficult-to-test (pp. 154?178). Baltimore, MD: Williams & Wilkie.