References
- Bromley, K., Irwin-De Vitis, L., & Modlo, M. (1995). Graphic organizers: Visual strategies for active learning. New York: Scholastic, Inc.
- Hyerle, D. (1996). Visual tools for constructing knowledge. Alexandria, VA: The Association for Supervision and Curriculum Development.
- Paul, R. & Elder, L. (2001). The miniature guide to critical thinking concepts and tools. Dillon Beach, CA: The Foundation for Critical Thinking.