Caldwell, J. H., Karp, K. S., Bay Williams, J. M., Rathmell, E., & Zbiek, R. M. Developing essential understanding of addition and subtraction for teaching mathematics in prekindergarten-grade 2.
Lua i Stíl Chicago (17ú heag.)Caldwell, Janet H., Karen S. Karp, Jannifer M. Bay Williams, Ed Rathmell, agus Rose Mary Zbiek. Developing Essential Understanding of Addition and Subtraction for Teaching Mathematics in Prekindergarten-grade 2.
Lua MLA (8ú heag.)Caldwell, Janet H., et al. Developing Essential Understanding of Addition and Subtraction for Teaching Mathematics in Prekindergarten-grade 2.
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