1. W. F. Andelt, 1992 .Effectiveness of livestock guarding dogs for reducing predation on domestic sheep., Wildlife Society Bulletin, 20 :55 –62 .
2. W. F. Andelt, 1999 .Relative effectiveness of guarding-dog breeds to deter predation on domestic sheep in Colorado., Wildlife Society Bulletin, 27 :706 –714 .
3. L. Coppinger, 1992 .Dog performance report 1991., DogLog, 2 :3 –5 .
4. R. Coppinger, and L. Coppinger .1980 .Livestock-guarding dogs: an Old World solution to an age-old problem., Country Journal, 7 :68 –77 .
5. Attentiveness of Guarding Dogs for Reducing Predation on Domestic Sheep