Yang (2000) considers Ai-Cham and Mak to be different dialects of the same language.
The Fangcun was first studied by Fang-Kuei Li in 1942, and the Yangfeng dialect was studied in the 1980s by Dabai Ni of the Minzu University of China. Ni also noted that the Mak people only sing Bouyei folk songs, and that about 5,000 Mak people have shifted to the Bouyei language.
^ abDabai, Ni. 1988. "Yangfeng Mak of Libo county." In Jerold A. Edmondson and David B. Solnit (eds.), Comparative Kadai: Linguistic studies beyond Tai, 87-106. Summer Institute of Linguistics Publications in Linguistics, 86. Dallas: Summer Institute of Linguistics and the University of Texas at Arlington.
Edmondson, J. A., & Solnit, D. B. (1988). Comparative Kadai: linguistic studies beyond Tai. Summer Institute of Linguistics publications in linguistics, no. 86. [Arlington, Tex.]: Summer Institute of Linguistics. ISBN 0-88312-066-6.
杨通银 / Yang Tongyin. 莫语研究 / Mo yu yan jiu (A Study of Mak). Beijing: 中央民族大学出版社 / Zhong yang min zu da xue chu ban she, 2000.