Macken, M. and Nguyen, H.T. 2006, "Nói Lái and the structure of the syllable", in Linguistics of the Tibeto-Burman Area, vol. 29, no. 2, pp. 1-58. cite.
DJVU PDF Macken, M.A. 2002, "Hmong Complex Initials", in Papers from the Tenth Annual Meeting of the Southeast Asian Linguistics Society, ed. M. Macken, pp. 199-214. Arizona State University, Program for Southeast Asian Studies. cite.