Hoffman, Leon, Mayday Haulofu, Mildred J. Johnson, and Michael L. Zettler. “Species of the Genus Gibberula Swainson, 1840 (Gastropoda: Cystiscidae) from Namibia”. European Journal of Taxonomy 1111, no. 1 (October 22, 2026): 1–18. Accessed October 22, 2026. https://europeanjournaloftaxonomy.eu/index.php/ejt/article/view/3344.