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) ·

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

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

Ethnologue: Languages of the World, 20th Edition (2017) . (2017) · edited by Paul M. Lewis, Gary F. Simons, and Charles D. Fennig · SIL International http://www.ethnologue.com

A Grammar of Yauyos Quechua . Aviva Shimelman (2017) · Studies in Diversity Linguistics. 9 Language Science Press http://langsci-press.org/catalog/book/83

Les Bayagas, petits hommes de la grande forêt equatoriale-lettre à Harry Alis ( pp. 548-554 ) . Paul Crampel (1890) · Compte Rendu des Seances de la Société de Géographie. 16-17