Hansson, Inga-Lill. 1990. "Akhə Akha and Pahi Akha — two Little Known Burmese-Yipho Languages." In The master said, to study and--: to Soren Egerod on the occasion of his sixty-seventh birthday, edited by Birthe Arendrup et al.. 89-105. East Asian Institute, University of Copenhagen.
Hansson, Inga-Lill. 1992. A Comparison of Gɔkhy and Akha. In Dai, Qingxia and Shi, Jinbo and Wu, Jingzhong and Yang, Yingxin and Xu, Shixuan and Fu, Ailan and Wu Hede (eds.), 彝緬語研究 YiMianyu yanjiu [Studies on Yi-Burmese Languages], 465-558. Chengdu: Sichuan Nationalities Publishing House.