1. Denken: Das Ordnen des Tuns Band II: Denkprozesse;Aebli,1981
2. The architecture of cognition;Anderson,1983
3. The effect of instruction on spatial visualization skills of middle school boys and girls;Ben-Chaim;American Educational Research Journal,1988
4. Readings in knowledge representation,1985
5. “Dreitafel-Projektion”;Bresser,1991