Bradley, David (2002). “The subgrouping of Tibeto-Burman”. In Beckwith, Christopher & Blezer, Henk. Medieval Tibeto-Burman languages. International Association for Tibetan Studies Proceedings 9 (2000) and Brill Tibetan Studies Library 2.. Leiden: Brill. pp. 73–112
Bradley, David (2003), “Lisu”, The Sino-Tibetan languages, London: Routledge, pp. 222-235, ISBN978-0-7007-1129-1.
Bradley, David (2007). “East and Southeast Asia”. In Moseley, Christopher. Encyclopedia of the World's Endangered Languages. London & New York: Routledge. pp. 349–424
Hansson, Inga-Lill (2003). “Akha”. In Graham Thurgood and Randy J. LaPolla. The Sino-Tibetan Languages. Routledge Language Family Series. London &New York: Routledge. pp. 236–252.
Matisoff, James A. (2003), “Lahu”, The Sino-Tibetan languages, London: Routledge, pp. 208-221, ISBN978-0-7007-1129-1.
Satterthwaite-Phillips, Damian (2011). Phylogenetic inference of the Tibeto-Burman languages or On the usefulness of lexicostatistics (and "Megalo"-comparison) for the subgrouping of Tibeto-Burman (Ph.D. dissertation). Stanford University.
Driem, George van (2001). Languages of the Himalayas: An Ethnolinguistic Handbook of the Greater Himalayan Region. Leiden: Brill