MLA Handbook by MLA style 9th edition provides guidelines in citing oral communications and Indigenous oral teachings. They are based on the models offered in the following article.
MacLeod, Lorisia. "More Than Personal Communication: Templates for Citing Indigenous Elders and Knowledge Keepers." KULA: Knowledge Creation, Dissemination, and Preservation Studies, vol. 5, no. 1, 2021, https://doi.org/10.18357/kula.135.
The Metro Writing Center offers this handout with examples on Citing Indigenous Oral Teachings.