National Council of Teachers of Mathematics, Columbia University. Teachers College. Dept. of Mathematical Education, & Rosskopf, M. F. (1971). Piagetian cognitive-development research and mathematical education. National Council of Teachers of Mathematics.
Chicago-viite (17. p.)National Council of Teachers of Mathematics, Columbia University. Teachers College. Dept. of Mathematical Education, ja Myron Frederick Rosskopf. Piagetian Cognitive-development Research and Mathematical Education. [Washington]: National Council of Teachers of Mathematics, 1971.
MLA-viite (9. p.)National Council of Teachers of Mathematics, et al. Piagetian Cognitive-development Research and Mathematical Education. National Council of Teachers of Mathematics, 1971.
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