Fritz, L. 2004. Western Steller Sea Lion Aerial Survey Results, June 2004. National Marine Fisheries Service, Seattle, WA, September 22, 2004. Available at <http://nmml.afsc.noaa.gov/AlaskaEcosystems/sslhome/survey2004.htm>.
 National Marine Fisheries Service. 2003. Supplement to the Endangered Species Act Section 7 Consultation Biological Opinion and Incidental Take Statement of October 2001 (concerning effect of Gulf of Alaska, Bering Sea/Aleutian Island fishing on Steller sea lions). Seattle, WA, June 19, 2003.