1. A male Guadalupe fur seal on San Nicolas Island, California;Bartholomew;Journal of Mammalogy,1950
2. Test excavations at Cottonwood Creek, Catalina Island, California;Bickford;Pacific Coast Archaeological Society Quarterly,1980
3. Carretta, J. V. , K. A. Forney , M. M. Muto , J. Barlow , J. Baker , B. Hanson and M. S. Lowry . 2007. U.S. Pacific marine mammal stock assessments: 2007. U.S. Department of Commerce. NOAA Technical Memorandum NOAA-TM-NMFS-SWFSC-398.