The Leko languages are a small group of languages spoken in northern Cameroon and eastern Nigeria. They were labeled "G2" in Joseph Greenberg's Adamawa language-family proposal. The Duru languages are frequently classified with the Leko languages, although their relationship remains to be demonstrated.[1]
^Güldemann, Tom (2018). "Historical linguistics and genealogical language classification in Africa". In Güldemann, Tom (ed.). The Languages and Linguistics of Africa. The World of Linguistics series. Vol. 11. Berlin: De Gruyter Mouton. pp. 58–444. doi:10.1515/9783110421668-002. ISBN978-3-11-042606-9.
^Blench, Roger (2019). An Atlas of Nigerian Languages (4th ed.). Cambridge: Kay Williamson Educational Foundation.