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2. Echevarria, J., M. E. Vogt, and D. J. Short. 2004. Making content comprehensible for English language learners: The SIOP model. 2nd ed. Boston: Allyn and Bacon.
3. Freeman, G. 2005. The graphic organizer, http://www.graphic.org/goindex.html
4. Gruber, K. J., S. D. Wiley, S. P. Broughman, G. A. Strizek, and M. Burian- Fitzgerald. 2002. Schools and staffing survey, 1999-2000: Overview of the data for public, private, public charter, and Bureau of Indian Affairs elementary and secondary schools, http://nces.ed.gov/pubs2002/21002313.pdf
5. Jacobson, J., and D. Raymer. 1999. The big book of reproducible graphic organizers: Fifty great templates to help kids get more out of reading, writing, social studies and more. New York: Scholastic.