↑ Paul Benedict, Sino-Tibetan: a Conspectus, Cambridge University Press, p. 68. James Matisoff, Handbook of Proto-Tibeto-Burman, University of California Press, 2003 p. 445.
↑ Harry Shorto. A Mon-Khmer Comparative Dictionary. Australian National University, 2006, p. 162.
↑ Axel Schuessler, ABC Etymological Dictionary of old chinese, University of Hawaii Press, 2006, pp. 593-594.