Carruthers, E., & Worthington, M. (2006). Children's mathematics: Making marks, making meaning (Second Edition.). Sage.
Chicago-referens (17:e uppl.)Carruthers, Elizabeth, och Maulfry Worthington. Children's Mathematics: Making Marks, Making Meaning. Second Edition. London ; Thousand Oaks, Calif.: Sage, 2006.
MLA-referens (8:e uppl.)Carruthers, Elizabeth, och Maulfry Worthington. Children's Mathematics: Making Marks, Making Meaning. Second Edition. Sage, 2006.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.