National Council of Teachers of Mathematics, Suydam. Marilyn N., & Reys, R. E. (1978). Developing computational skills. National Council of Teachers for Mathematics.
Chicago-referens (17:e uppl.)National Council of Teachers of Mathematics, Suydam. Marilyn N., och Robert E. Reys. Developing Computational Skills. Washingtin: National Council of Teachers for Mathematics, 1978.
MLA-referens (9:e uppl.)National Council of Teachers of Mathematics, et al. Developing Computational Skills. National Council of Teachers for Mathematics, 1978.
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