1. Abrikosov, G.G., Class Kamptozoa, Manual, vol. 1, Moscow, Leningrad: Biomedgiz, 1937, pp. 765–775.
2. Borisanova, A.O., Chernyshev, A.V., and Malakhova, V.V., Structure of the masculature in Barentsia discreta (Busk, 1886) (Kamptozoa, Coloniales), Russ. J. Mar. Biol., 2012, vol. 38, no. 1, pp. 22–34.
3. Dogel, V.A., Zoologiya pozvonochnykh (Zoology of Invertebrates), Moscow: Vysshaya shkola, 1981.
4. Atkins, D., The ciliary, feeding mechanism of the entoproct Polyzoa, and a comparison with that of the ectoproct Polyzoa, Quart. J. Microsc. Sci., 1932, vol. 75, pp. 393–423.
5. Ax, P., Multicellular Animals, vol. 2: The Phylogenetic System of the Metazoa, Springer, 2000.