1. Abrantes, P. (1993). Project work in school mathematics. In: De Lange, J. et al. (Eds), Innovation in Maths Education by Modelling and Applications. Chichester: Horwood, 355-364.
2. Aebli, H. (1985). Zwölf Grundformen des Lehrens. Stuttgart: Klett-Cotta.
3. Alsina, C. (2007). Less chalk, less words, less symbols … More objects, more context, more actions. In: Blum, W. et al. (Eds), Modelling and Applications in Mathematics Education. New York: Springer, 35-44.
4. Antonius, S. et al. (2007). Classroom activities and the teacher. In: Blum, W. et al. (Eds), Modelling and Applications in Mathematics Education. New York: Springer, 295-308.
5. Ball, D.L., Hill, H.C. & Bass, H. (2005). Knowing mathematics for teaching. In: American Educator, 29 (3), 14-46.