Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Carruthers, Elizabeth, y Maulfry Worthington. Children's Mathematics: Making Marks, Making Meaning. 2nd ed. London ; Thousand Oaks, Calif.: Sage, 2006.

Cita MLA (8a ed.)

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