@inbook{NBERc11121,
 Crossref = "NBERcutl08-1",
 title = "Trends in Assistance with Daily Activities: Racial/Ethnic and Socioeconomic Disparities Persist in the U.S. Older Population",
 author = "Vicki A. Freedman and Linda G. Martin and Jennifer Cornman and Emily M. Agree and Robert F. Schoeni",
 BookTitle = "Health at Older Ages: The Causes and Consequences of Declining Disability among the Elderly",
 Publisher = "University of Chicago Press",
 pages = "411-438",
 year = "2009",
 month = "January",
 URL = "http://www.nber.org/chapters/c11121",
}
@book{NBERcutl08-1,
 title = "Health at Older Ages: The Causes and Consequences of Declining Disability among the Elderly",
 author = "David M. Cutler and David A. Wise",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2008",
 URL = "http://www.nber.org/books/cutl08-1",
}