Ngmgbang (Riban, Rigmgbang) was formerly listed as a dialect of Bishi, but is clearly a distinct although related language. It is spoken in a few villages in Kaduna State.[2]
References
↑Piti at Ethnologue (18th ed., 2015) (subscription required)
12Blench, Roger (2019). An Atlas of Nigerian Languages (4thed.). Cambridge: Kay Williamson Educational Foundation.