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2. Breen, P. A., B. E. Adkins & D. C. Miller, 1978. Recovery rate in three exploited sea urchin populations from 1972 to 1977. Fisheries and Marine Services Manuscript Report 1446: 1–27.
3. Breen, P. A., D. C. Miller & B. E. Adkins, 1976. An examination of harvested sea urchin populations in the Tofino area. Fisheries Research Board of Canada Manuscript Report Series 1401: 1–23.
4. Carter, S. K., 1999. Ecosystem effects of simulated sea otter predation and commercial sea urchin harvest on nearshore benthic communities in northern Washington. M. S. Thesis. University of Washington, Seattle.
5. Carter, S. K. & G. R. VanBlaricom, 2002. Effects of experimental harvest on red sea urchins, Strongylocentrotus franciscanus, in northern Washington. Fisheries Bulletin 100: 662–673.