1. Cao, Z. Y. (2011). Hubei Tongcheng fangyan de yuyin tedian [The phonological features of Tongcheng dialect in Hubei province]. Yuyan Yanjiu, 1, 106–112.
2. Chao, Y. R. (1928). Studies in the Modern Wu-Dialects. Tsing Hua College Research Institute.
3. Chao, Y. R. (1930). A system of tone-letters. Le Maître Phonétique, 45, 24–27.
4. Chao, Y. R., Ding, S. S., Yang, S. F., Wu, Z. J., & Dong, T. H. (1948). Hubei fangyan diaocha baogao [Report on a survey of the dialects of Hupeh]. The Commercial Press.
5. Cun, X., & Zhu, X. N. (2013). Chengyuguanhua de shengdiao leixing [Tonotypes of Chengdu-Chongqing Mandarins]. Yuyan Yanjiu, 33(4), 1–11.