(of)Pilsbry, H. A. (1900). A new species of <i>Thersites</i>. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> (1899) 51: 473-474., available online athttps://www.biodiversitylibrary.org/page/6389672[details]
MolluscaBase eds. (2024). MolluscaBase. Hadra webbi (Pilsbry, 1900). Accessed through: Marine Species Traits editorial board (2024) Marine Species Traits at: https://marinespecies.org/traits./aphia.php?p=taxdetails&id=1149873 on 2024-10-13
Marine Species Traits editorial board (2024). Marine Species Traits. Hadra webbi (Pilsbry, 1900). Accessed at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1149873 on 2024-10-13
original description(of)Pilsbry, H. A. (1900). A new species of <i>Thersites</i>. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> (1899) 51: 473-474., available online athttps://www.biodiversitylibrary.org/page/6389672[details]