A comprehensive bibliography on linguistic input in the home, clinic, and/or classroom is presented. Three general categories of materials are included: language spoken to normal children, cross-cultural studies, and language spoken to special populations. Linguistic input is a term that refers to the special language register that parents use to address infants and young children. Typically, language directed to young children is contrasted with adult-to-adult conversation. Over 100 features of "baby talk" have been reported to occur cross culturally, in different socioeconomic groups and when parents address their typical children. Adults who are not parents and older children also adjust their language level when addressing infants and younger children. Bidirectional behaviors (i.e., adult perceptions and the child's linguistic level) appear to interact to stimulate the use of baby talk. It is suggested there is a need to decipher these interactive behaviors to conclusively establish the relevance of linguistic input for the language-learning child. The bibliography includes an author index that indicates the category under which the author is listed. (SW)