The Red Book of the Peoples of the Russian Empire . (1993) · edited by Andrew Humphreys and Krista Mits · http://www.eki.ee/books/redbook

LL-MAP (Language and Location: A Map Accessibility Project) . Anthony Aristar and Helen Aristar-Dry and Yichun Xie (2012) · http://llmap.org

EŠKĀŠ(E)MĪ (Ishkashmi) . Steblin-Kamensky, I. M. (1998) · Encyclopaedia Iranica, Online Edition. http://www.iranicaonline.org/articles/eskasemi-language

Endangered Languages Catalogue Project. Compiled by research teams at University of Hawai'i Mānoa and Institute for Language Information and Technology (LINGUIST List) at Eastern Michigan University . (2012) ·