Part H, Brachiopoda (Revised), vol. 6, ch. 4, p. 2590–2638 - Popov, L. E.; Holmer, L. E.; Cocks, L. R. M.; Bassett, M. G.; Racheboeuf, P. R.; Jia-Yu, Rong; Williams, Alwyn (Treatise on Invertebrate Paleontology, 2007)