↑Paul Benedict, Sino-Tibetan: a Conspectus, Cambridge University Press, p. 70. James Matisoff, Handbook of Proto-Tibeto-Burman, University of California Press, 2003, p. 342. Axel Schuessler, ABC Etymological Dictionary of old chinese, University of Hawaii Press, 2006, p. 562.
↑Aixin Li, Jinming Li, Jiangling Yang and Ross Perlin, Concise trung–english-chinese dictionary, SIL international, 2016, p. 100.
↑Manuel Widmer, A descriptive grammar of Bunan, De Gruyter Mouton, 2017, p. 863.