1. The suitability of American Sign Language in language intervention programs: Some linguistic, psycholinguistic, and sociolinguistic considerations;Frey,1979
2. Lloyd, L. L. Personal communication, 1978.
3. Centennial audit: National survey of language intervention for the retarded;Fristoe,1976
4. The application of Blissymbolics;McNaughton,1977
5. New trends in Blissymbolics;Cleeter,1979