Ulrich, E. O.; Scofield, W. H. (1897). The Lower Silurian Gastropoda of Minnesota. <em>The Geology of Minnesota.</em> 3(2): 813-1081, pls. 61-82., available online athttps://www.biodiversitylibrary.org/page/14923788 page(s): 821, 826 [details]
MolluscaBase eds. (2024). MolluscaBase. Helcionopsis Ulrich & Scofield, 1897 †. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1578872 on 2024-05-18
original descriptionUlrich, E. O.; Scofield, W. H. (1897). The Lower Silurian Gastropoda of Minnesota. <em>The Geology of Minnesota.</em> 3(2): 813-1081, pls. 61-82., available online athttps://www.biodiversitylibrary.org/page/14923788 page(s): 821, 826 [details]