[1] Bighorn Institute. 2005. Endangered Peninsular Bighorn Sheep. Website <www.bighorninstitute.org/endangered.htm> accessed September 30, 2005.
[2] U.S. Fish and Wildlife Service. 1998. Endangered Status for the Peninsular Ranges Population Segment of the Desert Bighorn Sheep in Southern California. Federal Register, March 18, 1998 (63 FR 13134).
[3] U.S. Fish and Wildlife Service. 2000. Recovery Plan for bighorn sheep in the Peninsular Ranges, California. Portland, OR. 251 pp.