1. Altman, I. and B. Rogoff (1987) World Views in Psychology: Trait, Interactional, Organismic, and Transactional Perspectives. In D. Stokolis and I. Altman (eds.) Handbook of Environmental Psychology, 1–40 (New York: Wiley).
2. Arievitch, I.M. and A. Stetsenko (2000) The Quality of Cultural Tools and Cognitive Development: Gal’perin’s Perspective and its Implications. Human Development, 43: 69–92.
3. Barab, S.A. and Roth, W.M. (2006). Curriculum-Based Ecosystems: Supporting Knowing from an Ecological Perspective. Educational Researcher, 35: 3–13.
4. Clark, A. (1997) Being There: Putting Brain, Body and World Together Again (Cambridge, MA: MIT Press).
5. Collis, B. and J. Moonen (2001). Flexible Learning in a Digital World: Experiences and Expectations (London: Kogan Page).