REFERENCES
- Kaplan, S. (2009). The grid: A model to construct differentiated curriculum for the gifted. In J. Renzulli (Ed.), Systems and models for developing programs for the gifted and talented (2nd ed.; pp. 235–252). Mansfield Center, CT: Creative Learning Press, Inc.
- Owen, J. (2007). Program evaluation: Forms and approaches (3rd ed.). New York: The Guilford Press.