B. Bannan-Ritland, und J. Baek. Handbook of design research methods in education: Innovations in science, technology, engineering, and mathematics learning and teaching, Routledge, New York, (NY), (2008)
C. Bergsten. Proceedings of the 30th Conference of the International Group for the Psychology of Mathematics Education, 2, Seite 153-160. Prague, Czech Republic July 16-21, (2006)