Spencer, M. P., Gornall 3rd, T. A., & Poulter, T. C. (1967). Respiratory and cardiac activity of killer whales. Journal of applied physiology, 22(5), 974-981. https://doi.org/10.1152/jappl.1967.22.5.974
Desforges, J-P; Hall, A; Mcconnell, B (2018). «Predicting global killer whale population collapse from PCB pollution». Science(engelsk). 361 (6409): 1373–1376. doi:10.1126/science.aat1953.Bruk av |besøksdato= krever at |url= også er angitt. (hjelp)
Leonard D & Øien N 2020 Estmated abundance of cetacean species in the Northeast Atlantic from Norwegian shipboard surveys conducted in 2014-2018. https://doi.org./10.7557/3.4694