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Kendra, Sewall (2015). «Social Complexity as a Driver of Communication and Cognition». Integrative and Comparative Biology55 (3): 384-395. doi:10.1093/icb/icv064. PMID26078368.
Alpin, L.M.; Farine, D.R.; Morand-Ferron, J.; Cole, E.F.; Cockburn, A.; Sheldon, B.C. (2013). «Individual personalities predict social behaviour in wild networks of great tits (Parus major)». Ecology Letters16 (11): 1365-1372. doi:10.1111/ele.12181. PMID24047530.