Gaya APA

Carruthers, E., Worthington, M. (2011). Understanding children's mathematical graphics : beginnings in play . New York: Open University Press McGraw-Hill Education.

Gaya MLA

Carruthers, Elizabeth., Worthington, Maulfry. "Understanding children's mathematical graphics : beginnings in play". New York: Open University Press McGraw-Hill Education, 2011. Text.