1. Why are signed languages easier to learn than spoken languages? Keynote address;Brown,1977
2. Iconicity of signs and their learnability by non-signers;Mandel,1977
3. Selecting sign systems for the multihandicapped students;Robbins,1976
4. Autistic children: A study of learning characteristics and programming needs;Arick;American Journal of Mental Deficiency,1978
5. The development of imitation by reinforcing behavioral similarity to a model;Baer;Journal of the Experimental Analysis of Behavior,1967