1. Catford, J. C. (1964). Phonation types: The classification of some laryngeal components of speech production. In D. Abercrombie, D. B. Fry, P. A. D. MacCarthy, N. C. Scott, & J. L. M. Trim (Eds.), In honor of Daniel Jones, papers contributed on the occasion of his eightieth birthday 12 September 1961 (pp. 26–37). Longmans Green & Co. Ltd.
2. 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.
3. Chao, Y. R., Noss, R. B., & Yamagiwa, J. K. (Eds.). (1967). Linguistics in East Asia and South East Asia (Reprinted in 2019). De Gruyter Mouton.
4. Cun, X., & Zhu, X. N. (2013). Chengyuguanhua de shengdiao leixing [Tonotypes of Chengdu-Chongqing Mandarins]. Yuyan Yanjiu, 33(4), 1–11.
5. Edmondson, J., Esling, J., Li, S., Harris, J. G., & Lama, Z. (2000). Lun Yiyu Baiyu de yinzhi he Huiyan jidai de guanxi—Houjing anli yanjiu. Minzu Yuwen, 6, 47–53.