Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, penyunting (2017). "Daic". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
Edmondson, Jerold A. The power of language over the past: Tai settlement and Tai linguistics in southern China and northern Vietnam. Studies in Southeast Asian languages and linguistics, Jimmy G. Harris, Somsonge Burusphat and James E. Harris, ed. Bangkok, Thailand: Ek Phim Thai Co. Ltd. http://ling.uta.edu/~jerry/pol.pdf (see page 15)