Worthington, M., & Carruthers, E. (2003). Children's mathematics: Making marks, making meaning. P. Chapman.
Chicago-viite (17. p.)Worthington, Maulfry, ja Elizabeth Carruthers. Children's Mathematics: Making Marks, Making Meaning. London: P. Chapman, 2003.
MLA-viite (9. p.)Worthington, Maulfry, ja Elizabeth Carruthers. Children's Mathematics: Making Marks, Making Meaning. P. Chapman, 2003.
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