The Sphecidae (Hymenoptera) of Fennoscandia and Denmark Reference:LOMHOLDT, O. 1975-1976; 1984 (2. Auflage). The Sphecidae (Hymenoptera) of Fennoscandia and Denmark. Fauna Entomologica Scandinavica, 4.1: 2.URL:http://antvid.org/PDF/Lomholdt_Fauna_entom_scand%20(Sphecidae,%20Crabronidae).pdf
