1. Acar Bayraktar, E. (2013). The reflection of spatial thinking on the interactional niche in the family. In C. Benz, B. Brandt, U. Kortenkamp, G. Krummheuer, S. Ladel, & R. Vogel (Eds.), Early mathematics learning—selected papers of the POEM 2012 conference. New York: Springer.
2. Blumer, H. (1954). What’s wrong with social theory? American Sociological Review, 18, 3–10.
3. Brandt, B., & Tiedemann, K. (2011). Alltagspädagogik in mathematischen Spielsituationen mit Vorschulkindern. [Folk pedagogy in mathematical play situations with preschoolers]. 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. 91–134). Münster: Waxmann.
4. Brandt, B., Vogel, R., & Krummheuer, G. (Eds.). (2011). Die Projekte erStMaL und MaKreKi. Mathematikdidaktische Forschung am “Center for Individual Development and Adaptive Education” (IDeA). Münster: Waxmann. The projects erStMaL and MaKreKi. Research in mathematics education in the “Center for Individual Development and Adaptive Education” (IDeA).
5. Bruner, J. (1960). The process of education. Cambridge: Harvard University Press.