(of)Ihering, H. von. (1912). Analyse der Süd-Amerikanischen Heliceen. <em>Journal of the Academy of Natural History of Philadelphia.</em> 15: 475–500., available online athttps://www.biodiversitylibrary.org/page/33245421 page(s): 488 [details]
MolluscaBase eds. (2025). MolluscaBase. Systrophia (Entodina) derbyi (Ihering, 1912). Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1645851 on 2025-05-20
Marine Species Traits editorial board (2025). Marine Species Traits. Systrophia (Entodina) derbyi (Ihering, 1912). Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1645851 on 2025-05-20
original description(of)Ihering, H. von. (1912). Analyse der Süd-Amerikanischen Heliceen. <em>Journal of the Academy of Natural History of Philadelphia.</em> 15: 475–500., available online athttps://www.biodiversitylibrary.org/page/33245421 page(s): 488 [details]
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