Personal Communication on Khamnigan . Juha Janhunen (2015) ·

Endangered Languages Catalogue Project. Compiled By Research Teams At University of Hawai'i Mānoa and Eastern Michigan University . (2015) ·

Red Book on Endangered Languages: Northeast Asia . Juha Janhunen; Tapani Salminen (2000) · http://www.helsinki.fi/~tasalmin/nasia_report.html