Parker, T.J. & Haswell, W.A. (1897)
A text-book of zoology. Ed. 1, vol. 2 (chordates). Macmillan, London
Haswell, W.A. (1885)
Studies on the elasmobranch skeleton. Proceedings of the Linnean Society of New South Wales, ser. 1, 9, 71–119