Stehmann, M. (1991)
Rhynchobatidae (p. 22), Rhinobatidae (pp 23-27), Platyrhinidae (p. 28), Rajidae (pp 29-50), Pristidae (pp 51-54) In QUERO, J.–C., HUREAU, J.C., KARRER, C., POST, A. & SALDANHA, L.(Eds): Check–List of the Fishes of the Eastern Tropical Atlantic(CLOFETA), vol. 1:xxxii+519 pp. UNESCO, SEI, JNICT–Portugal(1990) 1991(3 vols).