Wright, R. J., Martland, J., Stafford, A. K., & Stanger, G. (2006). Teaching number in the classroom with 4-8 year olds. Paul Chapman Pub..

Wright, Robert J., Jim Martland, Ann K. Stafford, and Garry Stanger. Teaching Number in the Classroom with 4-8 Year Olds. London ; Thousand Oaks, Calif.: Paul Chapman Pub., 2006.

Wright, Robert J., et al. Teaching Number in the Classroom with 4-8 Year Olds. Paul Chapman Pub., 2006.