World Register of Marine Species (WoRMS)
Calliostoma perfragile G. B. Sowerby III, 1903
MolluscaBase eds. (2026). MolluscaBase. Calliostoma perfragile G. B. Sowerby III, 1903. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=467241 on 2026-08-16
Sowerby, G. B. III. (1903). Mollusca of South Africa. Marine Investigations in South Africa. 2(3): 213-232, pls 3-5.
Thiele, J. (1925). Gastropoden der Deutschen Tiefsee-Expedition. II Teil. Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer "Valdivia" 1898-1899. 17(2): 35-382, pls 13-46 [reprints paginated 1–348, pls 1–34].