Gene Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen 2009 The Diversity of Fishes: Biology, Evolution, and Ecology (2nd edition). Wiley-Blackwel.
ISBN 978-1-4051-2494-2 p. 211 ↑ Frances A. Dipper, Sarah L. Fowler, Tim M. Reed 2002
Elasmobranch Biodiversity, Conservation And Management: "Proceedings Of The International Seminar And Workshop, Sabah, Malaysia, July 1997 " (IUCN Species Survival Commission Occasional Paper) World Conservation Union.
ISBN 978-2-8317-0650-4 p. 174
