Crowley, Terry. 1976. Phonological change in New England. In Grammatical categories in Australian languages, ed. R. M. W. Dixon, 19-50. Canberra: AIAS.
Crowley, Terry. 1997. In Chipping away at the past: a northern New South Wales perspective, ed. McConvell and Evans. Archaeology and linguistics: Aboriginal Australia in global perspective. Melbourne: Oxford University Press
MacPherson, John. 1904. Ngarrabul and other Aboriginal tribes: Part 2 Distribution of the tribes. Proceedings of the Linnean Society of New South Wales, vol.29, pt 4, pp. 677-84. (RS 50/5)
Mathews, Robert Hamilton. 1903. Languages of the New England Aborigines, New South Wales. Proceedings of the American Philosophical Society 42(173):249-263.