1. Beschta, R.L. and Ripple, W.J., Wolves, trophic cascades, and rivers in the Olympic National Park, USA, Ecohydrology, 2008, no. 1, pp. 118–130.
2. Beschta, R.L. and Ripple, W.J., Large predators and trophic cascades in terrestrial ecosystems of the western United States, Biol. Conserv., 2009, vol. 142, no. 11, pp. 2401–2414.
3. Priklonskii, S.G., Impact of the wolf on domestic animals, in Volk: Proiskhozhdenie, sistematika, morfologiya, ekologiya (The Wolf: Origin, Systematics, Morphology, Ecology), Bibikov, D.I., Ed., Moscow: Nauka, 1985, pp. 374–377.
4. Treves, A., Jurewicz, R.R., Naughton-Treves, L., et al., Wolf depredation on domestic animals in Wisconsin, 1976–2000, Wildl. Soc. Bull., 2002, vol. 30, no. 1, pp. 231–241.
5. Gazzola, A., Capitani, C., Mattioli, L., and Apollonio, M., Livestock damage and wolf presence, J. Zool., 2008, no. 274, pp. 261–269.