World Register of Marine Species (WoRMS)
Schuchert, P.; Choong, H.; Galea, H.; Hoeksema, B.; Lindsay, D.; Manko, M.; Pica, D. (2026). World Hydrozoa Database. Plumularia gracillima G.O. Sars, 1873. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=158176 on 2026-08-01
Sars, G.O. (1873). Bidrag til Kundskaben om Dyrelivet paa vore Havbanker. Forhandlinger i Videnskaps-Selskapet i Christiania. 1872: 73-119.