Moore, R. C., L. R. Cox, E. R. Trueman, N. D. Newell, and C. P. Nuttall. 1969. “Part N, Mollusca 6, Vol. 1, Ch. 1, P. 1–129”.
Treatise on Invertebrate Paleontology
, January.
https://doi.org/10.17161/dt.v0i0.5588
.