Template:Engel, 2001

• Engel, M.S. 2001. A monograph of the Baltic amber bees and evolution of the Apoidea (Hymenoptera). Bulletin of the American Museum of Natural History 259: 1–192. DOI: 10.1206/0003-0090(2001)259<0001:AMOTBA>2.0.CO;2  
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