(of)Say, T. (1822). An account of some of the marine shells of the United States. Journal of the Academy of Natural Sciences, Philadelphia. 2(1): 221-248; 2(2): 257-276, 302-325., available online athttp://biodiversitylibrary.org/page/36831411 page(s): 248 [details]
MolluscaBase eds. (2025). MolluscaBase. Euspira heros (Say, 1822). Accessed through: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2025) European Register of Marine Species at: https://www.vliz.be/vmdcdata/narms/narms.php?p=taxdetails&id=160315 on 2025-04-07
original description(of)Say, T. (1822). An account of some of the marine shells of the United States. Journal of the Academy of Natural Sciences, Philadelphia. 2(1): 221-248; 2(2): 257-276, 302-325., available online athttp://biodiversitylibrary.org/page/36831411 page(s): 248 [details]