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/

Sezo: Descriptive Grammar of a Mao Language (ELF grant abstract) . Girma Mengistu (2011) · http://www.endangeredlanguagefund.org/ll_funded_projects.php

Hozo-Sezo ( pp. 85-86 ) . Bender, Lionel M. (2007) · In Encyclopaedia Aethiopica edited by Siegbert Uhlig · Wiesbaden: Otto Harrassowitz

Mao Ethnography ( pp. 756-760 ) . Wolbert Smidt (2007) · In Encyclopedia Aethiopica edited by Uhlig, Siegbert · Otto Harrassowitz

Remnant Languages of Ethiopia and Sudan ( pp. 336-354 ) . M. L. Bender (1983) · In Nilo-Saharan language studies Monograph / Committee on Northeast African studies · Vol. 13 · edited by Bender, Marvin Lionel · East Lansing: African Studies Center, Michigan State University

Third S.L.L.E. survey on languages of the Begi/Asosa area . Wedekind, Charlotte and Klaus Wedekind and Ralph Siebert (2002) · http://www.sil.org/silesr/abstract.asp?ref=2002-056

A general description of Mao ( pp. 166-225 ) . Baye Yimam (2006) · Ethiopian Languages Research Centre (ELRC) Working Papers. 2 (2) ·