1. What's the use of imitation?;Clark;JChLang,1976
2. The uses of imitation;Snow;JChLang,1981
3. Haselkorn S. (1981). The development of the requests of young children from nonverbal strategies to the power of language. Unpublished Ed.D. thesis, Harvard Graduate School of Education.
4. The ontogenesis of speech acts;Bruner;JChLang,1975
5. The ostensive definition in vocabulary teaching;Ninio;JChLang,1980