1. & (2004a). A study of perceptions of junior high students of the water cycle in its application to teaching science in the ?science for all? era. website: stwww.weizmann.ac.il/g-earth.
2. & (2004b). Learning about Earth as a system: A new approach of designing environmental curricula. website: stwww.weizmann.ac.il/g-earth.
3. (2000). Bathtub dynamics: Initial results of a systems thinking inventory. website: http://web.mit.edu/jsterman/www/bathtub.pdf.
4. (1993). Student understanding of water and water resources: A review of the literature. Paper presented at the annual meeting of the American Educational Research Association. Atlanta, GA.
5. (1998). Qualitative inquiry and research design: Choosing among five traditions. Thousand Oaks, CA: Sage.