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Hawkinson JE, Acosta-Burruel M, Espitia SA (February 2000). "Opioid activity profiles indicate similarities between the nociceptin/orphanin FQ and opioid receptors". European Journal of Pharmacology. 389 (2–3): 107–114. doi:10.1016/S0014-2999(99)00904-8. PMID10688973.
"Etorphine HCl". Veterinary medicine for wildlife: immobilisation medicine for animals zoo animals. Zoo Pharm. Archived from the original on 2016-09-08. Retrieved 2013-10-11.
wildpharm.com
"Etorphine HCl". Veterinary medicine for wildlife: immobilisation medicine for animals zoo animals. Zoo Pharm. Archived from the original on 2016-09-08. Retrieved 2013-10-11.