Johnston-Wilder, S., & Mason, J. (2005). Developing thinking in geometry. Open University in association with Paul Chapman Pub.,.

Johnston-Wilder, Sue, and John Mason. Developing Thinking in Geometry. London ; Thousand Oaks, CA: Open University in association with Paul Chapman Pub.,, 2005.

Johnston-Wilder, Sue, and John Mason. Developing Thinking in Geometry. Open University in association with Paul Chapman Pub.,, 2005.