@inbook{NBERc2641,
 Crossref = "NBERuniv57-1",
 title = "The Meaning and Measurement of Partial and Disguised Unemployment",
 author = "Louis J. Ducoff and Margaret J. Hagood",
 BookTitle = "The Measurement and Behavior of Unemployment",
 Publisher = "NBER",
 pages = "155-166",
 year = "1957",
 URL = "http://www.nber.org/chapters/c2641",
}
@book{NBERuniv57-1,
 title = "The Measurement and Behavior of Unemployment",
 author = "Universities-National Bureau",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1957",
 URL = "http://www.nber.org/books/univ57-1",
}