Schuchert, P. (2024). World Hydrozoa Database.
Billardia Totton, 1930. Accessed through: Land J. van der (ed). (2008) UNESCO-IOC Register of Marine Organisms (URMO) at: https://www.marinespecies.org/Urmo/aphia.php?p=taxdetails&id=174410 on 2025-04-16
Land J. van der (ed). (2008). UNESCO-IOC Register of Marine Organisms (URMO).
Billardia Totton, 1930. Accessed at: https://marinespecies.org/urmo/aphia.php/aphia.php?p=taxdetails&id=174410 on 2025-04-16