This is an essay.
It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article, nor is it one of Wikipedia's policies or guidelines, as it has not been thoroughly vetted by the community. Some essays represent widespread norms; others only represent minority viewpoints.
Oral history is a research process for recording oral tradition, which is information passed verbally through generations of a community without being recorded into media. Wikipedia treats oral history as it does with any other primary source. See: WP:RS and WP:OR. Sources have to be published in a permanent form such print, video, or audio recording to be citable and verifiable.
There is no system in Wikipedia for citing unpublished oral tradition, just as neither Wikipedia nor any other research publication will cite unrecorded statements from unknown people or organizations. Anyone is welcome to convert oral tradition into an oral history, perhaps by publishing in Wikiversity, and cite that history in Wikipedia. The closer that an oral history comes to complying with the established scholarly tradition of producing oral histories, the better the source becomes for Wikipedia and knowledge preservation.