Reference

Raphael Arlettaz, Evelyne Guibert, Alain Lugon, Pascal Médard, Antoine Sierro (1993): Variability of fur coloration in Savi's bat Hypsugo savii (Bonaparte, 1837) – Bonn zoological Bulletin - früher Bonner Zoologische Beiträge. – 44: 293 - 297.