Flores, A., Dougherty, B. J., Everett, L., & Sophian, C. Developing essential understanding of number and numeration for teaching mathematics in prekindergarten - grade 2 (3a ed., reimpresión.).
Lua i Stíl Chicago (17ú heag.)Flores, Alfinio, Barbara J. Dougherty, Louis Everett, agus Catherine Sophian. Developing Essential Understanding of Number and Numeration for Teaching Mathematics in Prekindergarten - Grade 2. 3a ed., reimpresión.
Lua MLA (8ú heag.)Flores, Alfinio, et al. Developing Essential Understanding of Number and Numeration for Teaching Mathematics in Prekindergarten - Grade 2. 3a ed., reimpresión.
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