KESLING, Robert V.; BEAVER, Harold H.; MOORE, R. C.; FAY, Robert O.; WANNER, Johannes; MACURDA JR., Donald B. Part S, Echinodermata 1, vol. 1 & 2 , Ch. 3, p. 268 - 455. Treatise on Invertebrate Paleontology, [S. l.], 1968. DOI: 10.17161/dt.v0i0.5636. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5636.. Acesso em: 5 may. 2024.