Cita APA (7th ed.)

Carruthers, E., & Worthington, M. (2006). Children's mathematics: Making marks, making meaning (2nd ed.). Sage.

Cita Chicago (17th ed.)

Carruthers, Elizabeth, i Maulfry Worthington. Children's Mathematics: Making Marks, Making Meaning. 2nd ed. London: Sage, 2006.

Cita MLA (9th ed.)

Carruthers, Elizabeth, i Maulfry Worthington. Children's Mathematics: Making Marks, Making Meaning. 2nd ed. Sage, 2006.