This article is from the Publications about dogs FAQ, by Cindy Tittle Moore with numerous contributions by others.
Lopez, Barry H. _Of Wolves and Men_. Charles Scribner's Sons, 1982.
Description of wolves and their relationship with humans. Not
really a technical discussion of wolves like the _The Wolf_
Mech, L. David. _The Wolf_. University of Minnesota Press, 1970.
Complete description of the wolf, its behavior and ecology.
David Mech is a renowned wolf expert, and this is an extremly
informative and well written book.
Steinhart, Peter. _The Company Of Wolves_, Vintage Books, 1996.
From the book: "I think we have spent fifteen to twenty
thousand years transforming the wolf, through the process of
domestication, into an animal that for the most part can live
safely, happily, and humanely in human homes. In producing and
proliferating wolf hybrids, we take a big step backwards. We
are undoing what we have worked twenty thousand years to do."