De Gregorio, A. (1889). Esame di taluni molluschi viventi e terziari del Bacino Mediterraneo. <em>il Naturalista Siciliano.</em> 8 (10-11): 248-256 [July 1, 1889]; 8 (12):275-292; pl. 4-5 [September 1, 1889]., available online athttps://www.biodiversitylibrary.org/page/11572642 page(s): 287, pl. 5 fig. 17 [details]
MolluscaBase eds. (2021). MolluscaBase. Bulla propecylindracea de Gregorio, 1889. Accessed through: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2021) European Register of Marine Species at: http://www.marbef.org/data/aphia.php?p=taxdetails&id=747915 on 2023-12-08
Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2023). European Register of Marine Species. Bulla propecylindracea De Gregorio, 1889. Accessed at: https://vliz.be/vmdcdata/narms/narms.php?p=taxdetails&id=747915 on 2023-12-08