@inbook{NBERc11969,
 Crossref = "NBERbrow09-1",
 title = "Trends in the Level and Distribution of Income Support",
 author = "Robert Moffitt and John Karl Scholz",
 BookTitle = "Tax Policy and the Economy, Volume 24",
 Publisher = "The University of Chicago Press",
 pages = "111-152",
 year = "2010",
 month = "August",
 URL = "http://www.nber.org/chapters/c11969",
}
@book{NBERbrow09-1,
 title = "Tax Policy and the Economy, Volume 24",
 author = "Jeffrey R. Brown",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "The University of Chicago Press",
 year = "2010",
 URL = "http://www.nber.org/books/brow09-1",
}