P. J.  Hunter, ?Slugs - a study in applied ecology?, in Pulmonates: Systematics, Evolution, and Ecology, vol. 2A, V.  Fretter and Peake, J., Eds. London: Academic Press, 1978, pp. 271-286.

G. M.  Barker and Efford, M. G., ?Predatory gastropods as natural enemies of terrestrial gastropods and other invertebrates?, in Natural Enemies of Terrestrial Molluscs, G. M.  Barker, Ed. Cambridge, MA: CABI Publishing, 2004, pp. 279-403.