Philippi, R. A. (1844). Beiträge zur Kenntniss der Tertiaerversteinerungen des nordwestlichen Deutschlands. pp. i–iii–[iv] + 1–85–[87], 4 pls, Theodor Fischer, Kassel ["1843"]., available online athttps://www.biodiversitylibrary.org/page/31143990 page(s): 18 [details]
MolluscaBase eds. (2025). MolluscaBase. Bulla retusa R. A. Philippi, 1844 †. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1770305 on 2025-05-16
Marine Species Traits editorial board (2025). Marine Species Traits. Bulla retusa R. A. Philippi, 1844 †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1770305 on 2025-05-16
original descriptionPhilippi, R. A. (1844). Beiträge zur Kenntniss der Tertiaerversteinerungen des nordwestlichen Deutschlands. pp. i–iii–[iv] + 1–85–[87], 4 pls, Theodor Fischer, Kassel ["1843"]., available online athttps://www.biodiversitylibrary.org/page/31143990 page(s): 18 [details]
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