Theodore Holmes Bullock; Carl D. Hopkins; Arthur N. Popper (2005). Electroreception. Springer Science+Business Media, Incorporated. стр. 229. ISBN978-0-387-28275-6.
Baylis, Jeffrey (1981). „The Evolution of Parental Care in Fishes, with reference to Darwin's rule of male sexual selection”. Environmental Biology of Fishes. 6 (2): 223—251. doi:10.1007/BF00002788.
Laurin, M.; Reisz, R.R. (1995). „A reevaluation of early amniote phylogeny”. Zoological Journal of the Linnean Society. 113 (2): 165—223. doi:10.1111/j.1096-3642.1995.tb00932.x.