[1]
Melville, R.V. et al. 1966. Part U, Echinodermata 3, vol. 1 & 2, ch. 3, p. 211-366.
Treatise on Invertebrate Paleontology
. (Jan. 1966). DOI:
https://doi.org/10.17161/dt.v0i0.5655
.