@inbook{NBERc0073,
 Crossref = "NBERgert06-1",
 title = "Work and Leisure in the U.S. and Europe: Why So Different?",
 author = "Alberto F. Alesina and Edward L. Glaeser and Bruce Sacerdote",
 BookTitle = "NBER Macroeconomics Annual 2005, Volume 20",
 Publisher = "MIT Press",
 pages = "1-100",
 year = "2006",
 month = "April",
 URL = "http://www.nber.org/chapters/c0073",
}
@book{NBERgert06-1,
 title = "NBER Macroeconomics Annual 2005, Volume 20",
 author = "Mark Gertler and Kenneth Rogoff",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "MIT Press",
 year = "2006",
 URL = "http://www.nber.org/books/gert06-1",
}