↑Seal Specialist Group 1996. Zalophus californianus. In: IUCN 2007. 2007 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 07 March 2008.
↑Seal Specialist Group 1996. Zalophus japonicus. In: IUCN 2007. 2007 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 07 March 2008.
↑Seal Specialist Group 1996. Zalophus wollebaeki. In: IUCN 2007. 2007 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 07 March 2008.
