Literature

• Catalogue of Life. Species 2000 & ITIS. [link]

Literature references linked to higher taxa

• Encyclopedia of Life. [link] (Hymenoptera)
• Maddison, D. (ed.). Tree of Life web project. [link] (Apoidea)
• Various contributors 2017. Hymenoptera Online (HOL) [accessed 8 March 2017]. [link] (Aculeata)