@inbook{NBERc10087,
 Crossref = "NBERhox03-1",
 title = "School Vouchers. Results from Randomized Experiments",
 author = "Paul Peterson and William Howell and Patrick J. Wolf and David Campbell",
 BookTitle = "The Economics of School Choice",
 Publisher = "University of Chicago Press",
 pages = "107-144",
 year = "2003",
 month = "January",
 URL = "http://www.nber.org/chapters/c10087",
}
@book{NBERhox03-1,
 title = "The Economics of School Choice",
 author = "Caroline M. Hoxby",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2003",
 URL = "http://www.nber.org/books/hox03-1",
}