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2. Major decline in number of harbor seals, Phoca vitulina richardsi, on Tugidak Island, Gulf of Alaska;KW Pitcher;Marine Mammal Science,1990
3. Trites AW, Larkin PA (1992) The status of Steller sea lion populations and the development of fisheries in the Gulf of Alaska and Aleutian Islands. Vancouver: Fisheries Centre, University of British Columbia. 134 p.
4. Assessing the effectiveness of conservation measures: resolving the “wicked” problem of the Steller sea lion;IL Boyd;Biological Conservation,2010
5. Age-Structured modeling reveals long-term declines in the natality of western Steller sea lions;EE Holmes;Ecological Applications,2007