Stehmann, M. & Bürkel, D.L. (1990)
Order Rajiformes, Rajidae. In: O. Gon & P.C. Heemstra (Eds.), Fishes of the Southern Ocean (pp. 86–97). J.L.B. Smith Institute of Ichthyology, Grahamstown.
Stehmann, M. & Bürkel, D.L. (1984)
General remarks, explanation of terms and mode of presentation for Hypotremata, Pristidae, Torpedinidae, Rajidae, Chimaeridae, Rhinochimaeridae In Whitehead, P.J.P., Bauchot, M.–L., Hureau, J.C., Nielsen, J. & E. Tortonese (Eds.), Fishes of the North–Eastern Atlantic and the Mediterranean. Vol. 1. (pp. 151–155, 159–196, 212–218). Unesco, Paris