DJVU PDF Edmondson, J.A. 1996, "Voice qualities and inverse filtering in Chong", in The Mon-Khmer Studies Journal, vol. 26, pp. 107-116. cite.

DJVU PDF Edmondson, J.A and Gregerson, K. 1996, "Bolyu tone in Vietic perspective", in The Mon-Khmer Studies Journal, vol. 26, pp. 117-133. cite.