Level I
• Brown, Jonatha A. Oklahoma. Gareth Stevens, 2006.
• Heinrichs, Ann. Oklahoma. Child's World, 2006.
• Orr, Tamra B. Oklahoma. Children's Press, 2008.
• Sanders, Doug. Oklahoma. Benchmark Bks., 2006.
Level II
• Adkison, Danny M., and Palmer, L. M. The Oklahoma State Constitution. Greenwood, 2001.
• Baird, W. David, and Goble, Danney. Oklahoma, a History. Univ. of Okla. Pr., 2008.
• Baker, Terri M., and Henshaw, C. O., eds. Women Who Pioneered Oklahoma: Stories From the WPA Narratives. Univ. of Okla. Pr., 2007.
• Faulk, Odie B., and Welge, W. D. Oklahoma: A Rich Heritage. Am. Hist. Pr., 2004.
• Goins, Charles R., and Goble, Danney. Historical Atlas of Oklahoma. 4th ed. Univ. of Okla. Pr., 2006.
• Stein, Howard F., and Hill, R. F., eds. The Culture of Oklahoma. Univ. of Okla. Pr., 1993.
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