@inbook{NBERc6810,
 Crossref = "NBERblan00-1",
 title = "The Sensitivity of Experimental Impact Estimates (Evidence from the National JTPA Study)",
 author = "James J. Heckman and Jeffrey Smith",
 BookTitle = "Youth Employment and Joblessness in Advanced Countries",
 Publisher = "University of Chicago Press",
 pages = "331-356",
 year = "2000",
 month = "January",
 URL = "http://www.nber.org/chapters/c6810",
}
@book{NBERblan00-1,
 title = "Youth Employment and Joblessness in Advanced Countries",
 author = "David G. Blanchflower and Richard B. Freeman",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2000",
 URL = "http://www.nber.org/books/blan00-1",
}