Carruthers, E., & Worthington, M. (2006). Children's mathematics: Making marks, making meaning (Second Edition.). Sage.
Chicago-viite (17. p.)Carruthers, Elizabeth, ja Maulfry Worthington. Children's Mathematics: Making Marks, Making Meaning. Second Edition. London ; Thousand Oaks, Calif.: Sage, 2006.
MLA-viite (8. p.)Carruthers, Elizabeth, ja Maulfry Worthington. Children's Mathematics: Making Marks, Making Meaning. Second Edition. Sage, 2006.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.