1. Aebli, H. (1985). Das operative Prinzip (The operative principle).Mathematik Lehren 11, 4–6.
2. Affolter, W. & Beerli, G. (2003):mathbu. ch. 8, Zug: Klett und Balmer.
3. Bauer, L. (1990). Mathematikunterricht und Reflexion (Mathematics teaching and reflections).Mathematik Lehren 38, 6–9.
4. Bender, P. & Schreiber, A. (1980). The Principle of Operative Concept Formation in Geometry Teaching.Educational Studies in Mathematics 11, 59–90.
5. Bender, P. & Schreiber, A. (1985).Operative Genese der Geometrie (Operative genesis of geometry) Wien: Hölder-Pichler-Tempsky, Teubner.