Contribution to Book
The Blackwell Encyclopedia of Sociology
Published Article/Book Citation
The definitive version was published in The Blackwell Encyclopedia of Sociology, 2006, pp. 729-732. DOI: 10.1111/b.9781405124331.2007.x
Author posting. Copyright © Blackwell Pub., 2007. This is the publisher's version of the work. It is published her by permission of Blackwell Pub. for personal use, not for redistribution.