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.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCaldwell, Janet H., Karen S. Karp, Jannifer M. Bay Williams, Ed Rathmell, और Rose Mary Zbiek. Developing Essential Understanding of Addition and Subtraction for Teaching Mathematics in Prekindergarten-grade 2.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCaldwell, Janet H., et al. Developing Essential Understanding of Addition and Subtraction for Teaching Mathematics in Prekindergarten-grade 2.
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