F. Alvarez, D. I. MacKinnon, N. M. Savage, R. Jia-Yu, S. J. Carlson, and P. Cooper, “Part H, Brachiopoda (Revised), vol. 4, ch. 8, p. 1584–1616”, InvertebratePaleo, Jan. 2002, doi: 10.17161/dt.v0i0.5569.