1. How programming environment shapes perception, learning and goals
2. Haas, G. (n.d.) BFOIT Introduction to Computer Programming. Retrieved from http://guyhaas.com/bfoit/itp/Iteration.html#more_projects
3. Textbooks on qualitative research and method/methodology: Toward a praxis of method;Roth;Forum: Qualitative Social Research,2006
4. What changes in conceptual change?