1. Bell, M., & Burns, J. Personal communication, May, 1981.
2. Bell, M., & Burns, J. Counting, numeration, and arithmetic capabilities of primary school children. Proposal submitted to National Science Foundation, April, 1981.
3. Fuson, K. C., & Mierkiewicz, D. A detailed analysis of the act of counting. Paper presented at the Annual Meeting of the American Educational Research Association, Boston, April, 1980.
4. Fuson, K. C., & Richards, J. Children’s construction of the counting numbers: From a spew to a bidirectional chain. Unpublished manuscript, Northwestern University, 1979, and paper presented at the Annual Meeting of the American Educational Research Association, Boston, April, 1980.
5. Greeno, J. G., Riley, M. S., & Gelman, R. Young children’s counting and understanding of principles. Unpublished manuscript.