Brown, Moira W., Solange Brault, Philip K. Hamilton, Robert D. Kenney, Amy R. Knowlton, Marilyn K. Marx, Charles A. Mayo, Christopher K. Slay, and Scott D. Kraus. “Sighting Heterogeneity of Right Whales in the Western North Atlantic: 1980-1992”. J. Cetacean Res. Manage. (October 30, 2020): 245–250. Accessed November 27, 2021. https://journal.iwc.int/index.php/jcrm/article/view/284.