Barkas, W.J. (1877)
Ctenacanthus, a spine of Hybodus. Journal and Proceedings of the Royal Society of New South Wales, 11, 145–155
Barkas, W.J. (1874)
On the microscopical structure of fossil fshes from the Northumberland True Coal Measures. Monthly Review of Dental Surgery, 2, 344–349
Barkas, W.J. (1874)
List of the Palaeozoic fishes. Geological Magazine, decade 1, 542–553