[1] NOAA Fisheries. 2002. Stock Assessment Report. Gray Whale (Eschrichtius robustus): Eastern North Pacific Stock. National Oceanic and Atmospheric Administration, Washington, D.C.
[2] NOAA. 2004. Gray Whale Census (2001/2002). National Marine Mammal Laboratory, Alaska Fisheries Science Center. Available at <http://nmml.afsc.noaa.gov/CetaceanAssessment/GrayWhale/GrayCensus01-02.htm>.
[3] Reilly, S.B., Rice, D.W. and A.A. Wolman. 1983. Population Assessment of the Gray Whale, Eschrichtius Robustus, from California Shore Censuses, 1967-80. Fisheries Bulletin:81(2) 267-280.