World Register of Marine Species (WoRMS)
MolluscaBase eds. (2026). MolluscaBase. Cratis progressa Hedley, 1915. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=504707 on 2026-08-02
Hedley, C. (1915 ["1914"]). Studies on Australian Mollusca. Part XII. Proceedings of the Linnean Society of New South Wales. 39(4): 695–755, pls. 77–85.