@inbook{NBERc12078,
 Crossref = "NBERcook10-1",
 title = "The Deterrent Effect of Imprisonment",
 author = "Steven N. Durlauf and Daniel S. Nagin",
 BookTitle = "Controlling Crime: Strategies and Tradeoffs",
 Publisher = "University of Chicago Press",
 pages = "43-94",
 year = "2010",
 month = "July",
 URL = "http://www.nber.org/chapters/c12078",
}
@book{NBERcook10-1,
 title = "Controlling Crime: Strategies and Tradeoffs",
 author = "Philip Cook and Jens Ludwig and Justin McCrary",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2011",
 URL = "http://www.nber.org/books/cook10-1",
}