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Jeffreys J. G. 1862. British conchology: or, an account of the Mollusca which now inhabit the British Isles and the surrounding seas. Volume I. Land and freshwater shells. page 137-138. (англ.)
Scharff R. F. 1891. The slugs of Ireland. The Scientific Transactions of the Royal Dublin Society, volume IV., series II. Dublin, Royal Dublin Society; London, Williams & Norgate. 513—563. Limax maximus on pages page 517-521. plate LVII. (англ.)