1. Abbot RT (1974) American seashells. Van Nostrand Reinhold Company, New York, pp 99–100
2. Allendorf FW, Luikart G (2007) Conservation and the genetics of populations. Blackwell, USA
3. Azzopardi L, Schembri PJ (1997) Vermetid crusts from the maltese islands (Central Mediterranean). Mar Life 7:7–16
4. Bieler R (1989) Marine “Wormsnails”: a phylogenetic approach. [Abstract]. 10th International Malacological Congress, Tübingen, p 26
5. Bieler R (1995) Vermetid gastropods from Sao Miguel, Azores: Comparative anatomy, systematic position and biogeographic affiliation. Açoreana Supplement:173–192