found: Work cat.: 77457486: Manessy, G. Les langues Oti-Volta, 1975.
found: Ethnologue 2005(Oti-Volta: 33 languages, incl. 9 in Gurma subgroup & 16 in Western subgroup)
found: Dalby, Linguasphere, 1999:entry 91-GG (Moore+Gurma chain; also known as Oti-Volta; in Burkina Faso, Ghana, Togo, Mali, Côte d'Ivoire, Benin; divided into 5 nets: Moore Dagbane, Buli Konni, Yom Nawdm, Gurma Moba, and Biali Tamari)
found: Wikipedia.org website, May 26, 2006(Gur languages; clasified into six subgroups; the Oti-Volta is one of the largest; 28 languages including: Kusaal)
found: Briticanna.com website, June 23, 2006(Oti-Volta languages; the largest languages in the Oti-Volta group include Moore, the principal language of eastern Burkina Faso; Gurma; Gurenne; Dagbani, the principal language of northern Ghana; and Dagaari , spoken in northwestern Ghana; among the Grusi languages, Kabiye is widely spoken as a second language in northern Togo)