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K.DK.D.BroadK.DK.D., J.PJ.P.CurleyJ.PJ.P., E.BE.B.KeverneE.BE.B., Mother–infant bonding and the evolution of mammalian social relationships, „Philosophical Transactions of the Royal Society B: Biological Sciences”, 361 (1476), 2006, s. 2199–2214, DOI:10.1098/rstb.2006.1940, ISSN0962-8436, PMID:17118933, PMCID:PMC1764844 [dostęp 2019-11-01].
K.DK.D.BroadK.DK.D., J.PJ.P.CurleyJ.PJ.P., E.BE.B.KeverneE.BE.B., Mother–infant bonding and the evolution of mammalian social relationships, „Philosophical Transactions of the Royal Society B: Biological Sciences”, 361 (1476), 2006, s. 2199–2214, DOI:10.1098/rstb.2006.1940, ISSN0962-8436, PMID:17118933, PMCID:PMC1764844 [dostęp 2019-11-01].