MolluscaBase (2019). MolluscaBase. Helisoma (Helisoma) antrosa var. sayi F. C. Baker, 1928. Accessed at: http://molluscabase.org/aphia.php?p=taxdetails&id=1367144 on 2021-01-16
basis of recordInvertEBase. (2018). Authority files of U.S. and Canadian land and freshwater mollusks developed for the InvertEBase (InvertEBase.org) project. page(s): 322, pl. 19, fig. 20 [details]
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