1. Ahrné K, Bengtsson J, Elmqvist T (2009) Bumble bees (Bombus spp) along a gradient of increasing urbanization. PLoS ONE 4:e5574
2. Amiet F (1996) Hymenoptera Apidae, 1. Teil. Allgemeiner Teil, Gattungsschlüssel—Die Gattungen ApisBombus und Psithyrus. Insect Helv 12:1–98
3. Amiet F, Herrmann M, Müller A, Neumeyer R (2001) Apidae 3: Halictus, Lasioglossum. Fauna Helv 6:1–208
4. Amiet F, Herrmann M, Müller A, Neumeyer R (2004) Apidae 4: Anthidium, Chelostoma, Coelioxys, Dioxys, Heriades, Lithurgus, Megachile, Osmia, Stelis. Fauna Helv 9:1–273
5. Amiet F, Herrmann M, Müller A, Neumeyer R (2007) Apidae 5: Ammobates, Ammobatoides, Anthophora, Biastes, Ceratina, Dasypoda, Epeoloides, Epeolus, Eucera, Macropis, Melecta, Melitta, Nomada, Pasites, Tetralonia, Thyreus, Xylocopa. Fauna Helv 20:1–356