LaPolla, Randy J. 2003. "Dulong." In The Sino-Tibetan Languages, edited by G. Thurgood and R. J. Lapolla. 674-682. London & New York: Routledge.
Plaisir, Helen. 2003. "Lepcha." In The Sino-Tibetan Languages, edited by Graham Thurgood and Randy J. Lap. 705-716. London & New York: Routledge.
Phong, Nguyen Phy. 1996. "The Nguon Language of Quang Bình, Vietnam." In Mon-Khmer Studies: A Journal of Southeast Asian Linguistics and Languages, 26: 179-190.
Peterson, David A. 2003. "Hakha Lai." In The Sino-Tibetan Languages, edited by Graham Thurgood and Randy J. Lap. 409-426. London & New York: Routledge.