[1]
A. Williams, S. Lazarev, C. H. C. Brunton, D. A. T. Harper, and J. Yu-Gan, “Part H, Brachiopoda (Revised), vol. 2 & 3, ch. 6, p. 619–689”, InvertebratePaleo, Jan. 2000, doi: 10.17161/dt.v0i0.5211.