Constitution of the Choctaw Nation of Oklahoma:

http://www.choctawnation.com/history/documents/

Choctaw Nation Election Ordinances:

http://www.choctawnation.com/government/tribal-elections/

Constitution of the Citizen Potawatomi Nation:

http://www.potawatomi.org/government/constitution

Potawatomi Nation Election Code:

http://www.potawatomi.org/government/elections

Constitution of the Chickasaw Nation:

https://www.chickasaw.net/Our-Nation/Government/Chickasaw-Constitution.aspx

Chickasaw Nation Election Code:

https://www.chickasaw.net/Our-Nation/Government/Chickasaw-Code.aspx

Constitution of the Cherokee Nation:

http://www.cherokee.org/OurGovernment/Commissions/ConstitutionConvention/1975CherokeeNationConstitution.aspx

Cherokee Nation Election Code:

http://www.cherokee.org/OurGovernment/Commissions/ElectionCommission/Forms,Maps,VotingLocations.aspx

Constitution of the Cheyenne and Arapahoe Tribes:

http://www.c-a-tribes.org/government

Cheyenne and Arapahoe Election Code:

http://www.c-a-tribes.org/legislative-branch

Constitution of the Muscogee (Creek) Nation:

http://thorpe.ou.edu/constitution/muscogee/

Muscogee (Creek) Nation Election Code (Title 19, page 335):

http://public.esquireempire.com/file/view/Muscogee-Creek-Tribal-Code-Volume-3-Title-7-Section-1-101-through-Title-24-Section-7-502.pdf

Historic Choctaw Constitutions