References
- Brook , J. S. 1970 . A test of Piaget's theory of “nominal realism.” . J. Genet. Psychol. , 116 : 165 – 175 .
- Elkind , D. 1967 . Egocentrism in adolescence . Child Devel. , 38 : 1025 – 1034 .
- Kirk , R. 1968 . Experimental Design: Procedures for the Behavioral Sciences , Belmont, Calif. : Brooks-Cole .
- Koffka , N. 1924 . The Growth of the Mind: an Introduction to Psychology , New York : Harcourt Brace .
- Ogden , C. K. and Richards , I. A. 1930 . The Meaning of Meaning, , 3rd rev. ed. , New York : Harcourt Brace .
- Piaget , J. 1929 . The Child's Conception of the World , London : Routledge & Kegan Paul .
- Werner , H. and Kaplan , B. 1963 . Symbol Formation: An Organismic-Developmental Approach to Language and the Expression of Thought , New York : Wiley .