Cole ML, Herbert DG. Seven new narrowly endemic species of Gulella Pfeiffer, 1856 from eastern South Africa (Gastropoda, Streptaxidae) and status revision for another. EJT [Internet]. 2023Oct.9 [cited 2024Nov.23];900(1):1–31. Available from: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/view/2299