World Register of Marine Species (WoRMS)
Schuchert, P.; Choong, H.; Galea, H.; Hoeksema, B.; Lindsay, D.; Manko, M.; Pica, D. (2026). World Hydrozoa Database. Hydractinia brachyurae (Hirohito, 1988). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=284846 on 2026-08-29
Hirohito Emperor of Japan. (1988). The hydroids of Sagami Bay collected by His Majesty the Emperor of Japan. Biological Laboratory of the Imperial Household, Tokyo. pp. 179, plates 1-4.