KESLING, Robert V.; DURHAM, J. Wyatt; MACURDA JR., Donald B.; WANNER, Johannes; BEAVER, Harold H.; UBAGHS, Georges; MOORE, Raymond C.; FAY, Robert O. Part S, Echinodermata 1, vol. 1 & 2 , Ch. 2, p. 86 - 267. Treatise on Invertebrate Paleontology, [S. l.], 1968. DOI: 10.17161/dt.v0i0.5635. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5635. Acesso em: 13 apr. 2025.