Roger Blench (2026). An Atlas of Nigerian Languages (2020 edition). https://www.rogerblench.info/Language/Africa/Nigeria/Atlas%20of%20Nigerian%20Languages%202020.pdf
Scholarly reference listing each Nigerian language with its names, state and LGA locations, older speaker counts and classification. The author's site is no longer online; consulted through the Internet Archive copy. Some LGA names predate later LGA creations.