Não informado. (1955). Mathematics Teaching. Association of Teachers of Mathematics.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Mathematics Teaching. Derby, Inglaterra: Association of Teachers of Mathematics, 1955.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Mathematics Teaching. Association of Teachers of Mathematics, 1955.
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