According to Languages of the World (Voegelin and Voegelin 1977), there were about 100,000 speakers of the language, split evenly between the two nations.
Literature
Louis Berthe, Bei Gua: Itinéraire des ancêtres, Paris, 1972.
Claudine Friedberg, Boiled Woman and Broiled Man: Myths and Agricultural Rituals of the Bunaq of Central Timor, Edited James J. Fox, The Flow of Life. Essays on Eastern Indonesia, Harvard University Press, 1980.