Bock, P. (2024). World List of Bryozoa. Cyclotrypa circularis Kopajevich, 1984 †. Accessed through: Marine Species Traits editorial board (2024) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1401215 on 2024-09-13
Marine Species Traits editorial board (2024). Marine Species Traits. Cyclotrypa circularis Kopajevich, 1984 †. Accessed at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1401215 on 2024-09-13