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| California State Board of Education. (1987). History-social science framework for California public schools kindergarten through grade 12. Sacramento, CA: Author. |
| California State Board of Education. (1998). History-social science content standards for California public schools kindergarten through grade 12. Sacramento, CA: Author. |
| Center for Civic Education. (1994). National standards for civics and government. Calabasa, California: The Center. |
| Geography Education Standards Project. (1994). Geography for life: National geography standards. Washington, DC: National Geographic Society. |
| Indiana Department of Education. (2001). Indiana’s academic standards: social studies. Indianapolis, IN. Author. |
| Jenness, D. (1990). Making sense of social studies. New York. Macmillan Publishing Co. |
| Kendall, J.S. and Marzano, R.J. (2000). Content knowledge. A project of the Mid-continent regional educational laboratory (McREL). Arlington, VA: ASCD. |
| McLean, I. (1996). Oxford concise dictionary of politics. New York: Oxford University Press. |
| National Council for the Social Studies. (1994). Expectations of excellence. Curriculum standards for the social studies. Washington, DC: Author. |
| National Council on Economic Education. (2000). National content standards in economics. New York: Author. |
| O’Brien, P.K. (Ed.). (2000). Encyclopedia of world history. New York: Facts-on-File. |
The Commonwealth of Massachusetts, Department of Education. (1997). History and social science curriculum framework. Malden, MA: Author. |