Ethno-linguistic distribution map of the Nung, Tay, Zhuang and Bouyei in Vietnam and China. Source: "Major Zhuang Language Groups and Related Peoples" (Joshuaproject) ; "Map of Ethnic Groups in Vietnam" (IKAP Network for Capacity Building in MMSEA, 2005), cited by Emilie Ellis, Jae Yun Jeong and Margaret Munroe in "Comparative Perspectives on Forest Management and Development: Vietnam in Transition and Lessons from China", p. 9. ; "Giay, Nhang of China" (Joshuaproject) .