@inbook{NBERc8404,
 Crossref = "NBERshov08-1",
 title = "The Future of American Fertility",
 author = "Samuel H. Preston and Caroline Sten Hartnett",
 BookTitle = "Demography and the Economy",
 Publisher = "University of Chicago Press",
 pages = "11-36",
 year = "2010",
 month = "November",
 URL = "http://www.nber.org/chapters/c8404",
}
@book{NBERshov08-1,
 title = "Demography and the Economy",
 author = "John B. Shoven",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2011",
 URL = "http://www.nber.org/books/shov08-1",
}