Suydam, M. N., & Riedesel, C. A. (1972). Research on elementary mathematics. Washington: U.S. Dept. of Health, Education, and Welfare/Office of Education, National Center for Educational Communication; U.S. Govt. Print. Off..
Παραπομπή Chicago StyleSuydam, Marilyn N., and C. Alan Riedesel. Research On Elementary Mathematics. Washington: U.S. Dept. of Health, Education, and Welfare/Office of Education, National Center for Educational Communication; U.S. Govt. Print. Off., 1972.
Παραπομπή MLASuydam, Marilyn N., and C. Alan Riedesel. Research On Elementary Mathematics. Washington: U.S. Dept. of Health, Education, and Welfare/Office of Education, National Center for Educational Communication; U.S. Govt. Print. Off., 1972.
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