APA-viite (7. p.)
Copeland, R. W. (1979). How children learn matematics: Teaching implications of Piaget research.
Chicago-viite (17. p.)
Copeland, Richard W. How Children Learn Matematics: Teaching Implications of Piaget Research. 1979.
MLA-viite (9. p.)
Copeland, Richard W. How Children Learn Matematics: Teaching Implications of Piaget Research. 1979.
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