Cardinal 2011, с. e21086. Cardinal, Sophie et al. The Antiquity and Evolutionary History of Social Behavior in Bees // PLoS ONE 6 (6). 2011. DOI:10.1371/journal.pone.0021086. p. e21086. (на английски)
Engel 2001, с. 1661 – 1664. Engel, Michael S. Monophyly and Extensive Extinction of Advanced Eusocial Bees: Insights from an Unexpected Eocene Diversity // PNAS 98 (4). National Academy of Sciences, 2001. DOI:10.1073/pnas.041600198. p. 1661 – 1664. (на английски)
Dewulf 2014, с. 35 – 48. Dewulf, Alexandre et al. A new interpretation of the bee fossil Melitta willardi Cockerell (Hymenoptera, Melittidae) based on geometric morphometrics of the wing // ZooKeys 389. 2014. DOI:10.3897/zookeys.389.7076. p. 35 – 48. (на английски)
Hedtke 2013. Hedtke, Shannon M. et al. The bee tree of life: a supermatrix approach to apoid phylogeny and biogeography // BMC Evolutionary Biology 13 (138). 2013. DOI:10.1186/1471-2148-13-138. (на английски)