DJVU PDF Lehman, F.K. 1990, "Outline of a formal syntax of numerical expressions with especial reference to the phenomenon of numeral classifiers", in Linguistics of the Tibeto-Burman Area, vol. 13, no. 1, pp. 89-120. cite.

DJVU PDF Xu, X. 1989, "On the origin and development of classifiers in Jingpo", in Linguistics of the Tibeto-Burman Area, vol. 12, no. 2, pp. 15-23. cite.

DJVU PDF Caron, B.R. 1987, "A comparative look at Yao numerical classifiers", in Linguistics of the Tibeto-Burman Area, vol. 10, no. 2, pp. 151-168. cite.

DJVU PDF Court, C. 1987, "Some classes of classifier in Iu Mien (Yao)", in Linguistics of the Tibeto-Burman Area, vol. 10, no. 2, pp. 144-150. cite.

DJVU PDF Jaisser, A. 1987, "Hmong classifiers: a problem set", in Linguistics of the Tibeto-Burman Area, vol. 10, no. 2, pp. 169-176. cite.

DJVU PDF Goral, D.R. 1979, "Numeral classifier systems: a Southeast Asian cross-linguistic analysis", in Linguistics of the Tibeto-Burman Area, vol. 4, no. 1, pp. 1-72. cite.