Brownell, Robert L., Phillip J. Clapham, Tomio Miyashita, and Toshio Kasuya. “Conservation Status of North Pacific Right Whales”. J. Cetacean Res. Manage. (October 30, 2020): 269–286. Accessed November 28, 2023. https://journal.iwc.int/index.php/jcrm/article/view/281.