DJVU PDF Hayes, L.V.H. 1997, "On the track of Austric part II. Consonant mutation in early Austroasiatic", in The Mon-Khmer Studies Journal, vol. 27, pp. 13-41. cite.

DJVU PDF Qin Xiaohang. 1997, "Evolution of the initial consonant clusters “pl”, “kl”, “ml” in the Hongshuihe vernacular of Zhuang", in The Mon-Khmer Studies Journal, vol. 27, pp. 299-302. cite.