1. Baraldi, C. (2003) Planning childhood: Children's social participation in the town of adults, in: P. Christensen & M. O’Brien (Eds) Children in the city: Home, neighbourhood and community. (London, Routledge Falmer).
2. The development of fifth-grade children's problem-posing abilities;English;Educational Studies in Mathematics,1997
3. Carver, J.G. (1998). Aerial analysis of sedimentation in Dog River watershed. Course paper presented at GEO 480 (Field Work in Geography) at the University of South Alabama. Retrieved 01.01.2009 at http://www.southalabama.edu/geography/fearn/480page/98Gerrit/Gerritt.html.
4. Soft systems methodology and problem framing: Development of an environmental problem solving model respecting a new emergent reflexive paradigm;Gauthier;Canadian Journal of Environmental Education,1997
5. Problem posing from maps: Utilizing understanding;Gregg;Journal of Geography,1997