Somerset, A. (2002). Basic number skills: Why students fail in math. National Institute for Science & Mathematics Education Development.
Citace podle Chicago (17th ed.)Somerset, Anthony. Basic Number Skills: Why Students Fail in Math. Diliman, Quezon City, Science and Mathematics Education Institute: National Institute for Science & Mathematics Education Development, 2002.
Citace podle MLA (9th ed.)Somerset, Anthony. Basic Number Skills: Why Students Fail in Math. National Institute for Science & Mathematics Education Development, 2002.
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