MOORE, Raymond C.; FELL, H. Barraclough; UBAGHS, Georges. Part S, Echinodermata 1, vol. 1 & 2 , Ch. 1, p. 1 - 85. Treatise on Invertebrate Paleontology, [S. l.], 1968. DOI: 10.17161/dt.v0i0.5634. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5634. Acesso em: 13 apr. 2025.