1. Acar Bayraktar, E., Hümmer, A.-M., Huth, M., Münz, M. & Reimann, M. (2011). Forschungsmethodischer Rahmen der Projekte erStMaL und MaKreKi. In B. Brandt, R. Vogel, & G. Krummheuer (Eds.), Die Projekte erStMaL und MakreKi. Mathematikdidaktische Forschung am „Center for Individual Development and Adaptive Education“ (IDeA) (pp. 11–24). Münster: Waxmann.
2. Alexander, C. (1977). A pattern of language. Towns, buildings, construction. New York: Oxford U.P.
3. Benz, C. (2010). Minis entdecken Mathematik. Braunschweig: Westermann.
4. Bodrova, E. & Leong, D. J. (2001). Tools of the mind: A case study of implementing the Vygotskian approach in american early childhood and primary classrooms. Genf: International Bureau of Education.
http://www.ibe.unesco.org/publications/innodata/inno07.pdf.
Accessed 15 Mar 2011.
5. Bruner, J. (1986). Actual minds, possible worlds. Cambridge MA: Harvard University Press.