MolluscaBase eds. (2021). MolluscaBase. Helix helmii G. B. Sowerby I, 1838. Accessed at: http://molluscabase.org/aphia.php?p=taxdetails&id=1439133 on 2024-03-29
original descriptionSowerby, G. B. I. (1838). Miscellaneous observations. <em>The Malacological and Conchological Magazine.</em> 1: 27–29., available online athttps://www.biodiversitylibrary.org/page/8422964 page(s): 28 [details]