@inbook{NBERc4236,
 Crossref = "NBERunkn70-1",
 title = "NBER Report Six",
 author = "",
 BookTitle = "NBER Report Six",
 Publisher = "NBER",
 pages = "1-12",
 year = "1970",
 URL = "http://www.nber.org/chapters/c4236",
}
@book{NBERunkn70-1,
 title = "NBER Report Six",
 author = "NBER",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1970",
 URL = "http://www.nber.org/books/unkn70-1",
}