1. Bransford, J. D., & Stein, B. S. (1993). The IDEAL problem solver. (2nd ed.). New York: Freeman.
2. Motivating project-based learning sustaining the doing, supporting the learning;Blumenfeld;Educational Psychologist,1991
3. Buck Institute for Education (2007). Introduction to project based learning. Retrieved October 3, 2009, from http://www.bie.org/files/BIE_PBLintro.pdf.
4. The power of projects;Curtis;Educational Leadership,2002
5. The effect of project based learning on learning outcomes in the fifth-grade science education;Gultekin;Elementary Education Online,2007