1. The adaptive character of thought;Anderson,1990
2. Object permanence in five-month-old infants;Baillargeon;Cognition,1985
3. Bloom, L. (1970). Language development: Form and function in emerging grammars. MIT Research Monograph, No. 59.
4. Early sign language acquisition and its relation to cognitive and motor development;Bonvillian,1983
5. Early syntactic development: A cross-linguistic study with special reference to Finnish;Bowerman,1973