Koegel R. L. , O'Dell M. C. , Koegel L. K. (1987)
A natural language teaching paradigm for nonverbal autistic children.
Journal of Autism and Developmental Disorders
17(2), pp.187-200
Koegel R. L. , O'Dell M. C. , Dunlap G. (1988)
Producing speech use in nonverbal autistic children by reinforcing attempts.
Journal of Autism and Developmental Disorders
18(4), pp. 525-538.
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