DJVU PDF Proschan, F. 1996, "A survey of Khmuic and Palaungic languages in Laos and Vietnam", in The Fourth International Symposium on Language and Linguistics, Thailand, pp. 895-919. Institute of Language and Culture for Rural Development, Mahidol University. cite.

DJVU PDF Proschan, F. 1993, "Khmu play languages", in The Mon-Khmer Studies Journal, vol. 23, pp. 43-65. cite.