Howard, C. F., & Dumas, E. j. a. (1966). Teaching contemporary mathematics in the elementary school. Harper and Row.
Chicago-viite (17. p.)Howard, Charles Frederick, ja Enoch joint auth Dumas. Teaching Contemporary Mathematics in the Elementary School. New York: Harper and Row, 1966.
MLA-viite (9. p.)Howard, Charles Frederick, ja Enoch joint auth Dumas. Teaching Contemporary Mathematics in the Elementary School. Harper and Row, 1966.
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