Downer (1963). Downer, G.B., Chinese, Thai, and Miao-Yao(PDF), Shorto, H.L. (编), Linguistic Comparison in South East Asia and the Pacific, School of Oriental and African Studies, University of London: 133–139, 1963 [2021-06-12], (原始内容存档(PDF)于2016-03-04).
Downer (1963). Downer, G.B., Chinese, Thai, and Miao-Yao(PDF), Shorto, H.L. (编), Linguistic Comparison in South East Asia and the Pacific, School of Oriental and African Studies, University of London: 133–139, 1963 [2021-06-12], (原始内容存档(PDF)于2016-03-04).