Bradley, David (2004). Endangered Central Ngwi Languages of Central Yunnan. 37th International Conference on Sino-Tibetan Languages and Linguistics, Lund University, Sweden (Keynote Presentation). Archived from the original on 2021-08-11. Retrieved 2016-04-16.
Bradley, David (2004). Endangered Central Ngwi Languages of Central Yunnan. 37th International Conference on Sino-Tibetan Languages and Linguistics, Lund University, Sweden (Keynote Presentation). Archived from the original on 2021-08-11. Retrieved 2016-04-16.