World Register of Marine Species (WoRMS)
Norenburg, J.; Chernyshev, A.; Kajihara, H.; Maslakova, S. (2026). World Nemertea Database. Oerstedia immutabilis (Riches, 1893). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=122818 on 2026-08-29
Riches, T. H. (1893). A List of the Nemertines of Plymouth Sound. Journal of the Marine Biological Association of the United Kingdom, 3: 1-29