DJVU PDF Lee, E. 1996, "Bipartite negative in Chamic", in The Mon-Khmer Studies Journal, vol. 26, pp. 291-317. cite.

DJVU PDF Thomas, D. 1987-1988, "A 19th Century Perception of Chamic Relations", in The Mon-Khmer Studies Journal, vol. 16-17, pp. 181-182. cite.