Schuchert, P.; Choong, H.; Galea, H.; Hoeksema, B.; Lindsay, D.; Manko, M.; Pica, D. (2025). World Hydrozoa Database.
Billardia subrufa (Jäderholm, 1904). Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=174415 on 2025-06-06
Marine Species Traits editorial board (2025). Marine Species Traits.
Billardia subrufa (Jäderholm, 1904). Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=174415 on 2025-06-06