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* Becker, G.: Geometrieunterricht. Klinkhardt, Bad Heilbronn, 1980.  
 
* Becker, G.: Geometrieunterricht. Klinkhardt, Bad Heilbronn, 1980.  
* [[Peter Bender]], Schreiber, A.: Operative Genese der Geometrie. Hölder-Pichler-Tempsky, Wien und B.G. Teubner, Stuttgart, 1985.  
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* [[Peter Bender|Bender, P.]], Schreiber, A.: Operative Genese der Geometrie. Hölder-Pichler-Tempsky, Wien und B.G. Teubner, Stuttgart, 1985.  
 
* Close, G.D.: Children's understanding of angles at the primary/ secondary transfer stage. Dissertation on the Department of Mathematical Science and Computing, London 1982.  
 
* Close, G.D.: Children's understanding of angles at the primary/ secondary transfer stage. Dissertation on the Department of Mathematical Science and Computing, London 1982.  
 
* Dörfler ,W.: Protocols of actions as a cognitive tool for knowledge construction. Ms. Universität Klagenfurt (Ersch. 1989 in PME), 1989.  
 
* Dörfler ,W.: Protocols of actions as a cognitive tool for knowledge construction. Ms. Universität Klagenfurt (Ersch. 1989 in PME), 1989.