Moore, R. C., J. W. Wells, H. J. Harrington, Dorothy Hill, Hilbrand Boschma, and Libbie H. Hyman. 1956. “Part F, Coelenterata, Ch. 1, P .1-106”.
Treatise on Invertebrate Paleontology
, January.
https://doi.org/10.17161/dt.v0i0.5536
.