Gray Wolf Reintroduction
Yellowstone National Park
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Halfpenny, J.C. 2003. Yellowstone Wolves in the Wild. Riverbend Publishing, MT. 98 pp.
IUCN. 1995. Guidelines for Re-Introductions. Prepared by the ICN/SSC Re-introduction Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK.
Kauffman, M., J. Brodie and E. Jules. 2010. Are wolves saving Yellowstone's aspen? A landscape-level test of a behaviorally mediated trophic cascade. Ecology 91:2742-2755.
Smith, D.W. and G. Ferguson. 2005. Decade of the Wolf: Returning the Wild to Yellowstone. The Lyons Press, CT. 216 pp.
Yellowstone National Park. 2011. Yellowstone Resources and Issues. Mammoth, WYI Division of Interpretation.