@inbook{NBERc9193,
 Crossref = "NBERaesm72-2",
 title = "Microdata: Lessons from the SEO and the Graduated Work Incentive Experiment",
 author = "Harold W. Watts",
 BookTitle = "Annals of Economic and Social Measurement, Volume 1, number 2",
 Publisher = "NBER",
 pages = "73-81",
 year = "1972",
 month = "April",
 URL = "http://www.nber.org/chapters/c9193",
}
@book{NBERaesm72-2,
 title = "Annals of Economic and Social Measurement, Volume 1, number 2",
 author = "Sanford V. Berg, editor",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1972",
 URL = "http://www.nber.org/books/aesm72-2",
}