Downer, G.B. Chinese, Thai, and Miao-Yao. Shorto, H.L. (编). Linguistic Comparison in South East Asia and the Pacific(PDF). School of Oriental and African Studies, University of London. 1963: 133–139 [2021-03-07]. (原始内容存档(PDF)于2016-03-04).
Manson, Ken. (2009). Prolegomena to Reconstructing Proto-Karen. La Trobe Papers in Linguistics, 12. Available at [1] (页面存档备份,存于互联网档案馆)
Downer, G.B. Chinese, Thai, and Miao-Yao. Shorto, H.L. (编). Linguistic Comparison in South East Asia and the Pacific(PDF). School of Oriental and African Studies, University of London. 1963: 133–139 [2021-03-07]. (原始内容存档(PDF)于2016-03-04).