Harley, Heidi E. (13 November 2007). "Whistle discrimination and categorization by the Atlantic bottlenose dolphin (Tursiops truncatus): A review of the signature whistle framework and a perceptual test". Behavioural Processes. 77 (2). Elsevier: 243–268. doi:10.1016/j.beproc.2007.11.002. PMID18178338.
Harley, Heidi E. (13 November 2007). "Whistle discrimination and categorization by the Atlantic bottlenose dolphin (Tursiops truncatus): A review of the signature whistle framework and a perceptual test". Behavioural Processes. 77 (2). Elsevier: 243–268. doi:10.1016/j.beproc.2007.11.002. PMID18178338.