Avery, MI; Krebs, JR; Hegner, RE (1984). "A Case of Bigamy in the European Bee-Eater (Merops apiaster)". The Auk. 101 (3): 609–610. doi:10.1093/auk/101.3.609. S2CID89508037.
Roulston, TH; Goodell, K (2011). "The role of resources and risks in regulating wild bee populations". Annual Review of Entomology. 56: 293–312. doi:10.1146/annurev-ento-120709-144802. PMID20822447.
Roulston, TH; Goodell, K (2011). "The role of resources and risks in regulating wild bee populations". Annual Review of Entomology. 56: 293–312. doi:10.1146/annurev-ento-120709-144802. PMID20822447.
Avery, MI; Krebs, JR; Hegner, RE (1984). "A Case of Bigamy in the European Bee-Eater (Merops apiaster)". The Auk. 101 (3): 609–610. doi:10.1093/auk/101.3.609. S2CID89508037.