Brood, K. 1981.
Hirnantian (Upper Ordovician) Bryozoa from Baltoscandia.Recent and Fossil Bryozoa: Papers Presented at the 5° International Conference on Bryozoa, pp. 19-27.
Männil, R. M. 1959.
Questions of stratigraphy and bryozoans of the Ordovician of Estonia.
Bassler, R. S. 1911.
The Early Paleozoic Bryozoa of the Baltic Provinces.Bulletin of the US National Museum77,
1-382.