Processes. 2009. L. David Mech; Luigi Boitani. Wolves: Behavior, Ecology, and Conservation. University of Chicago Press. 1 October 2010. ISBN 978-0-226-51698-1
Recovery. L. David Mech & Luigi Boitani (编). Wolves: behavior, ecology, and conservation. University of Chicago Press. 2003: 317–340. ISBN 978-0-226-51696-7