@inbook{NBERc12432,
 Crossref = "NBERwise11-2",
 title = "Comment on "Economic Preparation for Retirement"",
 author = "Robert J. Willis",
 BookTitle = "Investigations in the Economics of Aging",
 Publisher = "University of Chicago Press",
 pages = "113-117",
 year = "2011",
 month = "July",
 URL = "http://www.nber.org/chapters/c12432",
}
@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",
}