POLIS, A. R., & BEARD, E. M. (1973). Fundamental mathematics for elementary teachers: A behavioral objectives approach. Harper and Row.
Chicago-viite (17. p.)POLIS, A. Richard, ja Earl M. BEARD. Fundamental Mathematics for Elementary Teachers: A Behavioral Objectives Approach. New York: Harper and Row, 1973.
MLA-viite (9. p.)POLIS, A. Richard, ja Earl M. BEARD. Fundamental Mathematics for Elementary Teachers: A Behavioral Objectives Approach. Harper and Row, 1973.
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