[1]
Moore, R.C. and Strimple, H.L. 1978. Part T, Echinodermata 2, vol. 1-3, ch. 6, p. 631 - 759. Treatise on Invertebrate Paleontology. (Jan. 1978). DOI:https://doi.org/10.17161/dt.v0i0.5647.