@inbook{NBERc9435,
 Crossref = "NBERaesm72-3",
 title = "Constructing A New Data Base From Existing Microdata Sets: The 1966 Merge File",
 author = "Benjamin Okner",
 BookTitle = "Annals of Economic and Social Measurement, Volume 1, number 3",
 Publisher = "NBER",
 pages = "326-361",
 year = "1972",
 month = "July",
 URL = "http://www.nber.org/chapters/c9435",
}
@book{NBERaesm72-3,
 title = "Annals of Economic and Social Measurement, Volume 1, number 3",
 author = "Sanford V. Berg, editor",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1972",
 URL = "http://www.nber.org/books/aesm72-3",
}