Panksepp, Jaak (2005). Affective neuroscience : the foundations of human and animal emotions ([Reprint] изд.). Oxford [u.a.]: Oxford University Press. стр. 9. ISBN978-0-19-509673-6. „Our emotional feelings reflect our ability to subjectively experience certain states of the nervous system. Although conscious feeling states are universally accepted as major distinguishing characteristics of human emotions, in animal research the issue of whether other organisms feel emotions is little more than a conceptual embarrassment”
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Scherer, K. R. (2005). „What are emotions? And how can they be measured?”. Social Science Information. 44 (4): 693—727. S2CID145575751. doi:10.1177/0539018405058216.