@inbook{NBERc12431,
 Crossref = "NBERwise11-2",
 title = "Economic Preparation for Retirement",
 author = "Michael D. Hurd and Susann Rohwedder",
 BookTitle = "Investigations in the Economics of Aging",
 Publisher = "University of Chicago Press",
 pages = "77-113",
 year = "2011",
 month = "August",
 URL = "http://www.nber.org/chapters/c12431",
}
@book{NBERwise11-2,
 title = "Investigations in the Economics of Aging",
 author = "David A. Wise",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2012",
 URL = "http://www.nber.org/books/wise11-2",
}