National Council of Teachers of Mathematics. (1926). Yearbook. National Council of Teachers of Mathematics.
Chicago-čujuhus (17. p.)National Council of Teachers of Mathematics. Yearbook. [Place of publication not identified]: National Council of Teachers of Mathematics, 1926.
MLA-čujuhus (9. p.)National Council of Teachers of Mathematics. Yearbook. National Council of Teachers of Mathematics, 1926.
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