References
- Beilin , H. 1965 . Learning and operational convergence in logical thought development . J. Exper. Child Psychol. , 2 : 317 – 339 .
- Christie , J. F. 1970 . The use of discrimination learning set training to teach preschool children to conserve length , Syracuse University . Unpublished master's thesis
- Flavell , J. H. 1963 . The Developmental Psychology of Jean Piaget , Princeton, N.J. : Van Nostrand .
- Gelman , R. S. 1967 . Conservation, attention, and discrimination , University of California at Los Angeles . Unpublished doctoral dissertation
- Piaget , J. 1952 . The Child's Conception of Number , London : Routledge & Kegan Paul .
- Rothenberg , B. B. and Orost , J. H. 1969 . The training of conservation of number in young children . Child Devel. , 40 : 707 – 726 .
- Sullivan , E. 1967 . “ Acquisition of conservation of substance through film modeling techniques ” . In Recent Research on the Acquisition of Substance , Educational Research Series No. 2 Edited by: Brison , D. W. and Sullivan , E. Ontario : Ontario Institute for Studies of Education .
- Wallach , L. and Sprott , R. L. 1964 . Inducing number conservation in children . Child Devel. , 35 : 1057 – 1071 .
- Wallach , M. A. 1963 . “ Research on children's thinking ” . In Child Psychology , Edited by: Stevenson , H. W. Chicago : National Society for Study of Education .
- Zimilies , H. 1966 . The development of conservation and differentiation of number . Mono. Soc. for Res. in Child Devel. , 31 ( No. 6 )