World Register of Marine Species (WoRMS)
Bock, P.; Figuerola, B. (2026). World List of Bryozoa. Cyphotrypa switzeriensis Karklins, 1984&nbsp;&#8224;. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1401283 on 2026-08-02
Karklins, O. L. (1984). Trepostome and cystoporate bryozoans from the Lexington Limestone and the Clays Ferry Formation (Middle and Upper Ordovician) of Kentucky. U.S. geological survey, professional paper, 1066-I: 1-105