Cameron R. A. D., Cook L. M. & Hallows J. D. (29 March 1996). "Land Snails on Porto Santo: Adaptive and Non-Adaptive Radiation". Philosophical Transactions: Biological Sciences351(1337): 309-327. doi:10.1098/rstb.1996.0025, JSTOR.
Fontaine B., Bouchet P., Van Achterberg K., Alonso-Zarazaga M. A., Araujo R. et al. (2007). "The European union's 2010 target: Putting rare species in focus." Biological Conservation139: 167-185. Table 2 on p. 173. doi:10.1016/j.biocon.2007.06.012. PDF.
Cameron R. A. D., Cook L. M. & Hallows J. D. (29 March 1996). "Land Snails on Porto Santo: Adaptive and Non-Adaptive Radiation". Philosophical Transactions: Biological Sciences351(1337): 309-327. doi:10.1098/rstb.1996.0025, JSTOR.
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Fontaine B., Bouchet P., Van Achterberg K., Alonso-Zarazaga M. A., Araujo R. et al. (2007). "The European union's 2010 target: Putting rare species in focus." Biological Conservation139: 167-185. Table 2 on p. 173. doi:10.1016/j.biocon.2007.06.012. PDF.
