1. Bassler, R. S. (1953): Bryozoa. [In:]Moore, M. C. (Ed.): Treatise on Invertebrate Paleontology, Pt.G: G 1 — G 253; Geol. Soc. America and Univ. of Kansas Press; Lawrence.
2. Boardman, R. S. &Cheetham, A. H. (1969): Skeletal growth, intracolony variation, and evolution in Bryozoa, a review. — J. Paleont.,43: 205–233, 8 Fig., Taf. 27-30; Tulsa, Oklahoma.
3. Boardman, R. S. &Cheetham, A. H. (1973): Degrees of Colony Dominance in Stenolaemata and Gymnolaemate Bryozoa. — [In:]Boardman, Cheetham &Oliver (Eds.): Animal Colonies: 121–220, 40 Fig; Stroudsbourg.
4. Boardman, R., Cheetham, A. H. et al. (1983): Bryozoa — [In:] Treatise on Invertebrate Paleontology, Pt. G. (Revised),1, Introduction, Order Cystoporata, Order Cryptostomata: 1–625,295 Fig. Geol. Soc. America, Inc. and Univ. of Kansas Boulder, Colorado, and Lawrence, Kansas.
5. Boardman, R. S.;Cheetham, A. H. &Cook, P. L. (1969): Intracolony variation and the genus concept in Bryozoa. — Proc. V. 1 pt. C: 294–320,12 Textfig. North Amer. Paleont. Convention, Chicago 1969.