^Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Usun Apau Kenyah". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
^also Lepo Jengan, Lepo Aga, Uma Ake, Lepo Ga, Lepo La’ang, Sambup, and Likan