^Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian (編). Katchal. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History. 2016.
^Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian (編). Trinkut. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History. 2016.
^ 4.04.1Edward Horace Man, 1889, A dictionary of the central Nicobarese language
^Robert Parkin, 1991, A guide to austroasiatic speakers and their languages
