Reys, R., Lindquist, M. M., Lambdin, D. V., & Smith, N. L. Helping children learn mathematics (10a ed.).
Lua i Stíl Chicago (17ú heag.)Reys, Robert, Mary M. Lindquist, Diana V. Lambdin, agus Nancy L. Smith. Helping Children Learn Mathematics. 10a ed.
Lua MLA (8ú heag.)Reys, Robert, et al. Helping Children Learn Mathematics. 10a ed.
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