1. Astrova, G.G., Morphology, History of Development, and Systematics of the Ordovician and Silurian Bryozoans, Trudy Paleontol. Inst. Akad. Nauk SSSR, 1965, vol. 106), pp. 1–431.
2. Bassler, R.S., The Early Paleozoic Bryozoa of the Baltic provinces, Bull. Smith. Inst. U.S. Nat. Mus., 1911, no. 77, pp. 1–382.
3. Bassler, R.S., Bryozoa, Mem. Geol. Surv. Can., 1928, no. 154, pp. 143–168.
4. Dybowski, W., Die Chaetetiden der Ostbaltischen Silur-Formation, Verh. Russ. Keis. Miner. Ges. St.-Petersb., 1877, vol. 2, no. 14, pp. 1–134.
5. Eichwald, E., Zoologia specialis quam expositis animalibus tum vivis, fom fossilibus potissimum Rossiae in universum, et Poloniae in species, vol. 1. Bryozoa, Vilnae: Typis Josephi Zawadzki, 1829.