Collins Guide to the Insects of Britain and Western Europe; Finnish edition: Larry Huldén, Lauri Kaila, Hans Silfverberg; Euroopan Hyönteisopas; ISBN 951-1-12880-9
Some related literature:
A checklist of aculeate Hymenoptera of Finland (Hymenoptera, Apocrita Aculeata)
Not. Ent. 66 (2): 65-85
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Keep in mind that the taxonomic information is copied from various sources, and may include many inaccuracies. Expert help is welcome.