Schuchert, P. (2024). World Hydrozoa Database. Hydractinia hooperii (Sigerfoos, 1899). Accessed through: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2024) European Register of Marine Species at: https://www.marbef.org/data/aphia.php?p=taxdetails&id=231666 on 2024-04-28
Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2024). European Register of Marine Species. Hydractinia hooperii (Sigerfoos, 1899). Accessed at: http://www.marbef.org/data/aphia.php?p=taxdetails&id=231666 on 2024-04-28