Tribal law is notably is distinct from federal Indian law. Whereas federal Indian law concerns the relationship between federal, state, and tribal governments, tribal law is the law tribes develop and apply to their members and territories.
For more on tribal law sources, see:
Engaging the Third Sovereign: The Nature, Reach, and Sources of Tribal Law Wisconsin Lawyer (May 2015).
"Whatever Tribal Precedent There May Be": The (Un)Availability of Tribal Law, 106 Law Library Journal 199 (2014).
Tribal constitutions and codes are the heart of self-government for over 500 federally recognized tribes, and are the lifeblood of Indian sovereignty. Each tribal government operates according to its own constitutional rules. Most tribes have written constitutions. Many of the constitutions are modeled on form constitutions provided by the United States Department of the Interior pursuant to the Indian Reorganization Act of 1934.
Tribal courts are courts of general jurisdiction, operating within federal Indian law and under jurisdiction conferred by tribal law.