Wiradhuri and Ngiyambaa appear to be more closely related to each other than to Gamilaraay, as they show some common features that Gamilaraay lacks. The languages are close enough to be accepted as related in the conservative classification of Dixon (2002). Bowern (2011) lists the Yuwaaliyaay and Yuwaalaraay varieties of Gamilaraay as separate languages.[1]Bigambal may have been another, if it wasn't one of the Banjalung languages. The Gujambal language has been listed as Wiradhuric, but is undocumented.
Austin, P. K. (1997). "Proto Central New South Wales phonology". In Tryon, D. T.; Walsh, M. (eds.). Boundary rider: essays in honour of Geoffrey O'Grady. Canberra: Pacific Linguistics. pp. 21–49.
Austin, P. (1993). A Reference Dictionary of Gamilaraay, northern New South Wales. Bundoora: La Trobe University Department of Linguistics.
Austin, P.; Williams, C.; Würm, S. A. (1980). "The linguistic situation in north central New South Wales". In Rigsby, B.; Sutton, P. (eds.). Contributions to Australian Linguistics. Canberra: Pacific Linguistics. pp. 167–80.
