Não informado. (1970). Journal for Research in Mathematics Education. National Council of Teachers of Mathematics.
Citace podle Chicago (17th ed.)Não informado. Journal for Research in Mathematics Education. Reston, Va: National Council of Teachers of Mathematics, 1970.
Citace podle MLA (8th ed.)Não informado. Journal for Research in Mathematics Education. National Council of Teachers of Mathematics, 1970.
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