Yongning Na, which is spoken in Yongning township, Lijiang municipality, Yunnan, China, has been documented by Jacques and Michaud (2011).
Lataddi Narua is notable for having only two tonal levels.
- Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Yongning Na". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
- Jacques, Guillaume, and Alexis Michaud. 2011. "Approaching the historical phonology of three highly eroded Sino-Tibetan languages." Diachronica 28:468-498.
- Dobbs, Roselle, and La Mingqing. 2016 "The two-level tonal system of Lataddi Narua." Linguistics of the Tibeto-Burman Area, Vol. 39:1 (2016), 67–104. doi:10.1075/ltba.39.1.04dob
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