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/

Glottolog . http://www.glottolog.org/glottolog/

Judeo-Greek . Julia G. Krivoruchko (2002) · edited by Sarah Bunin Benor · Jewish Language Research Website http://www.jewish-languages.org/judeo-greek.html

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) ·