National Council of Teachers of Mathematics & Osborne, A. (1977). An in-service handbook for mathematics education. National Council of Teachers of Mathematics.
Citace podle Chicago (17th ed.)National Council of Teachers of Mathematics a Alan Osborne. An In-service Handbook for Mathematics Education. Reston, Va.: National Council of Teachers of Mathematics, 1977.
Citace podle MLA (8th ed.)National Council of Teachers of Mathematics a Alan Osborne. An In-service Handbook for Mathematics Education. National Council of Teachers of Mathematics, 1977.
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