Reference

Jacint Ventura, Joaquim [Joaquím] Gosalbez [Gosálbez Gosalbez-Noguera] (1989): Taxonomic review of Arvicola terrestris (Linnaeus, 1758) (Rodentia, Arvicolidae) in the Iberian Peninsula – Bonn zoological Bulletin - früher Bonner Zoologische Beiträge. – 40: 227 - 242.