Nguyen Van Loi (2019). Tones in the Cuoi Language of Tan Ki District in Nghe An Province, Vietnam [1]. The Journal of the Southeast Asian Linguistics Society
William J. Duiker The A to Z of Vietnam 2010, p357 "Tây Vu, Administrative and territorial term for an ancient district in Vietnam. Located in the lower Red
祈山县北接老挝华潘省的桑怒,西接老挝川圹省的農黑區(英语:Nong Het district)和Mok May區(英语:Mok May district),南接老挝波里坎塞省的Khamkeut區(英语:Khamkeut district)和萬東區(英语:Viengthong_district, Bolikhamsai),东接越南乂安省的襄阳县。
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