Rigwe has highly complex phonology.[6] The presence of the lateral fricative /ɬ/ in Rigwe, unusual among Plateau languages, suggests that there used to be West Chadic languages in the area with this phoneme.[7]
^Blench, Roger (2019). An Atlas of Nigerian Languages (4th ed.). Cambridge: Kay Williamson Educational Foundation.
^Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Irigwe". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
^"Rigwe". Ethnologue. SIL International. Retrieved August 10, 2020.
^Blench, Roger M. 2018. Nominal affixes and number marking in the Plateau languages of Central Nigeria. In John R. Watters (ed.), East Benue-Congo: Nouns, pronouns, and verbs, 107–172. Berlin: Language Science Press. doi:10.5281/zenodo.1314325