English
Reference
Donald B. Baker (1999): The nomenclature of European Colletes (Hymenoptera, Apoidea) - a correction The dates of the Apoidea of Frey-Gessner's Hymenoptera Helvetiae (1898-1912) and Hyménoptères du Valais (1902-1916) (Hymenoptera) – Beiträge zur Entomologie = Contributions to Entomology – 49: 485 - 488.
