South Asia and the Middle East ( pp. 283-348 ) . George van Driem (2007) · In Encyclopedia of the World's Endangered Languages edited by Christopher Moseley · London & New York: Routledge

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

Literacy and the Vernacular in Tajik Badakhshan: Research in Rushani, Khufi, Bartangi, and Roshorvi . Elisabeth Abbess and Katja Müller and Daniel Paul and Calvin Tiessen and Gabriela Tiessen (2010) · http://gamma.sil.org/silesr/2010/silesr2010-015.pdf

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) ·