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) ·

Ethnologue: Languages of the World, 16th Edition (2009) . (2009) · edited by M. Paul Lewis · SIL International http://www.ethnologue.com/

Atlas of the World’s Languages in Danger . Christopher Moseley (ed.) (2010) · UNESCO Publishing http://www.unesco.org/culture/en/endangeredlanguages/atlas

World Oral Literature Project . http://www.oralliterature.org

East and Southeast Asia ( pp. 349-424 ) . David Bradley (2007) · In Encyclopedia of the World's Endangered Languages edited by C. Moseley · London & New York: Routledge

Language Use and Attitudes of Kachok Speakers: Towards an Assessment of the Kachok Language Vitality . Magaspag, Chitse E. (2012) · SIL Electronic Survey Reports 2012 · Vol. 038 · http://www.sil.org/system/files/reapdata/91/93/29/91932979721033469875328274790364566457/silesr2012_038.pdf