DJVU PDF Riddle, E.M. 1992, "The relative marker uas in Hmong", in Linguistics of the Tibeto-Burman Area, vol. 16, no. 2, pp. 57-68. cite.
DJVU PDF Riddle, E.M. 1989, "Serial verbs and propositions in White Hmong", in Linguistics of the Tibeto-Burman Area, vol. 12, no. 2, pp. 1-13. cite.