Fox, James J. (1972). "Ndaonese." In Ethnic Groups of Insular Southeast Asia, edited by Frank M. LeBar. Vol. 1, Indonesia, Andaman Islands, and Madagascar, 109. New Haven: HRAF Press.
Jonker, ]. C. G. (1903). "Iets over de Taal van Dao." In Album-Kern (Opstellen geschreven ter eere van Dr. H. Kern), 85-89. Leiden: E. J. Brill.
Ormeling, F. J. (1956). The Timor Problem: A Geographical Interpretation of an Underdeveloped Island. Groningen and Bandung: ]. B. Wolters.