Tohutoro APA (7th ed.)
National Council of Teachers of Mathematics. (1965). Instruction in arithmetic: Twenty-fifth yearbook (3a edición.).
Tohutoru Kātū Chicago (17th ed.)
National Council of Teachers of Mathematics. Instruction in Arithmetic: Twenty-fifth Yearbook. 3a edición. 1965.
Tohutoro MLA (9th ed.)
National Council of Teachers of Mathematics. Instruction in Arithmetic: Twenty-fifth Yearbook. 3a edición. 1965.
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