The classification of Nunggubuyu is "problematic". Heath (1997) postulates that Nunggubuyu is most closely related to Ngandi and Anindilyakwa. However, Evans (2003) believes that the similarities are shared retentions rather than shared innovations, and that Nunggubuyu is closest to the eastern Gunwinyguan languages.
^Nordhoff, Sebastian; Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2013). "Nunggubuyu". Glottolog. Leipzig: Max Planck Institute for Evolutionary Anthropology.
^Numbulwar Numburindi Community Government Council (2007). "Numbulwar's Profile & Information". Retrieved 2007-11-11. The major language spoken in Numbulwar is Noongabuyu (Noon-ga-boy-you) along with creole. English is generally regarded as a third language in the community.
^Nicholas Evans, 2003, Bininj Gun-wok: a pan-dialectal grammar of Mayali, Kunwinjku and Kune, vol. 1
^Capell, A. "A New Approach to Australian Linguistics", Oceania linguistic monographs1 (1956), Sydney: University of Sydney, p. 68. Cited in John Harris, "Facts and Fallacies of Aboriginal Number Systems", SIL work paper series B, volume 8 (1982), p. 161.