• [Wiki] https://en.wikipedia.org/wiki/Gibbula_umbilicalis.
• [Wiki_nl] https://nl.wikipedia.org/wiki/Gibbula_umbilicalis.
• [marlin] http://www.marlin.ac.uk/species/detail/1481.
• [DonnBrun2016] Donnarumma, L., Bruno, R., and Russo, A. T. G. F. (2016). Population ecology of Gibbula umbilicaris and Gibbula ardens (Gastropoda: Trochidae) in a Posidonia oceanica seagrass bed. Italian Journal of Zoology, 83:103--112.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [Lebo1937] Lebour, M. V. (1935). The eggs and larvae of the british prosobranchs with special reference to those living in the plankton. J. Mar. Biol. Ass. UK, 22:105--116.
• [Noke2016] Noke, R. (2016). What is driving the range extension of Gibbula umbilicalis (Gastropoda, Trochidae) in the eastern English Channel? PhD thesis, Bournemouth University.
• [RobiGree2010] Robinson, L. A., Greenstreet, S. P. R., Reiss, H., Callaway, R., Craeymeersch, J., de Boois, I., Degraer, S., Ehrich, S., Fraser, H. M., Goffin, A., Kroncke, I., Jorgenson, L. L., Robertson, M., and Lancaster, J. (2010). Length-weight relationships of 216 North Sea benthic invertebrates and fish. J. Mar. Biol. Ass. UK, 90:95--104.
• [Will1964] Williams, E. E. (1964). The growth and distribution of Gibbula umbilicalis (Da Costa) on a rocky shore in Wales. Journal of Animal Ecology, 33:433--442.