"CFR Courts" or the Court of Indian Offenses serve as the trial courts for some Oklahoma tribes that do not have their own justice systems. Appeals may be taken from the trial court to the Court of Indian Appeals.
Matthew L. M. Fletcher, Toward a Theory of Intertribal and Intratribal Common Law, 43 Hous. L. Rev. 701 (2006)
Rose Carmen Goldberg, No Tribal Court Is an Island? Citation Practices of the Tribal Judiciary, 3 Am. Indian L.J. 247 (2014) (analyzing 3-year sample of tribal court cases to see what precedents were cited).
Nell Jessup Newton, Tribal Court Praxis: One Year in the Life of Twenty Indian Tribal Courts, 22 Am. Indian L. Rev. 285 (1998)
April L. Wilkinson, Student Paper, A Framework for Understanding Tribal Courts and the Application of Fundamental Law: Trhough the Voices of Scholars in the Field of Tribal Justice, 15 Tribal L.J. 67 (2015)
William P. Zuger, A Baedeker to the Tribal Court, 83 N. Dak. L. Rev. 55 (2007) (Standing Rock Sioux Tribal Court)
There is no comprehensive source for all tribal court decisions, either in print or online.
Some tribes post some or all of their decisions on their websites. See list at the Tribal Court Clearinghouse.
Some tribes publish their cases separately.
Selected tribal court decisions are published in the Indian Law Reporter.
Some tribes' cases are available in commercial databases, Lexis, Versuslaw, or Westlaw.
To find sources for a given tribe, use the National Indian Law Library's Tribal Law Gateway.
Lexis includes (selected) decisions for over 30 tribes.
VersusLaw includes cases from over 22 tribal courts (21 tribes).
Westlaw includes tribal court decisions from 22 tribes, plus its Oklahoma Tribal Court Reports collection, which includes "opinions issued by one of the CFR or tribal courts in Oklahoma, including the tribal courts, Courts of Indian Appeals, and Courts of Indian Offenses."
Some tribes' opinions are in multiple sources, some in only one (and some not available at all). How can you compare the coverage of the different sources? The following chart lists tribes and the sources that publish at least some of each tribe's cases.
If you are interested in materials for one tribe in particular, the best access is through the National Indian Law Library's Tribal Law Gateway.