World Register of Marine Species (WoRMS)
Leptothyra duyfjesi van Regteren Altena, 1938
MolluscaBase eds. (2026). MolluscaBase. Leptothyra duyfjesi van Regteren Altena, 1938&nbsp;&#8224;. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1664284 on 2026-08-02
Regteren Altena, C. O. van. (1942). The marine Mollusca of the Kendeng beds (east Java). Gastropoda part IV (Families Cassididae - Ficidae inclusive). Leidsche Geologische Mededeelingen. 13 (1): 89-120.