World Register of Marine Species (WoRMS)
MolluscaBase eds. (2026). MolluscaBase. Retusa excavata Sykes, 1904. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1743233 on 2026-08-30
Sykes, E. R. (1904). On the Mollusca procured during the "Porcupine" Expeditions 1869-1870. Supplemental notes, part I. Proceedings of the Malacological Society of London. 6: 23-40.