@inbook{NBERc1125,
 Crossref = "NBEReast68-1",
 title = "Appendix for Chapter 4",
 author = "Richard A. Easterlin",
 BookTitle = "Population, Labor Force, and Long Swings in Economic Growth: The American Experience",
 Publisher = "NBER",
 pages = "225-233",
 year = "1968",
 URL = "http://www.nber.org/chapters/c1125",
}
@book{NBEReast68-1,
 title = "Population, Labor Force, and Long Swings in Economic Growth: The American Experience",
 author = "Richard A. Easterlin",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1968",
 URL = "http://www.nber.org/books/east68-1",
}