National Council of Teachers of Mathematics. (1966). Experiences in mathematical geometry. National Council of Teachers of Mathematics.
Chicago-viite (17. p.)National Council of Teachers of Mathematics. Experiences in Mathematical Geometry. Washington, D. C: National Council of Teachers of Mathematics, 1966.
MLA-viite (9. p.)National Council of Teachers of Mathematics. Experiences in Mathematical Geometry. National Council of Teachers of Mathematics, 1966.
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