1 Bailey, Jill. Animals under Threat: Gray Wolf. Chicago, IL: Heinemann Library, 2005.
2 Brandenburg, James and Judy Brandenburg. Face to Face with Wolves. Washington, D.C.: National Geographic Society, 2008.
3 Dutcher, Jim and Jamie Dutcher. Living with Wolves. Seattle, WA: Braided River, 2005.
4 Grambo, Rebecca L. Wolf: Legend, Enemy, Icon. Buffalo, NY: Firefly Books, Inc., 2005.
5 Leach, Michael. Wolf: Habitats, Life Cycles, Food Chains, Threats. New York, NY: Raintree Steck-Vaughn Publishers, 2003.
6 Ménatory, Anne. The Art of Being a Wolf. New York, NY: Barnes & Noble Books, 2005.
7 Reid, Mary E. Wolves and Other Wild Dogs. Chicago, IL: World Book, Inc., 2005.