@inbook{NBERc8357,
 Crossref = "NBERhalt98-1",
 title = "Analytical Needs and Empirical Knowledge in Labor Economics",
 author = "Robert Topel",
 BookTitle = "Labor Statistics Measurement Issues",
 Publisher = "University of Chicago Press",
 pages = "51-74",
 year = "1998",
 month = "January",
 URL = "http://www.nber.org/chapters/c8357",
}
@book{NBERhalt98-1,
 title = "Labor Statistics Measurement Issues",
 author = "John Haltiwanger and Marilyn E. Manser and Robert Topel",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1998",
 URL = "http://www.nber.org/books/halt98-1",
}