Literature
- Banaszak, J. and Dochkova, B. 2014. Bees (Hymenoptera, Apoidea, Apiformes) in the agricultural landscape of Bulgaria: species diversity Journal of Apicultural Science Vol. 58 No. 1 pp. 29-49.
- Bossert, S. 2014. The high alpine bee fauna (Hymenoptera: Apoidea) of the Zillertal Alps, Austria. Biodivers Data J. 2014; (2): e1115.
- Else, G.R. & Edwards, M. 2018. Handbook of the Bees of the British Isles. Ray Society, London.
- Söderman, G. and Leinonen, R. 2003. Suomen Mesipistiäiset ja niiden uhanalaisuus. Tremex Press Oy, Helsinki.