Reference
Giuseppe Manganelli, Folco Giusti (1988): Notulae Malacologicae, XXXVII. New data on Arion intermedins Normand in Italian Apennines and major Tyrrhenian Islands (Pulmonata: Arionidae). (Studies on the Sardinian and Corsican malacofauna, VII) – Archiv für Molluskenkunde – 119: 39 - 54.