@inbook{NBERc1430,
 Crossref = "NBERfuch67-2",
 title = "I A STATISTICAL ANALYSIS OF PRODUCTIVITY IN SELECTED SERVICE INDUSTRIES IN THE UNITED STATES, 1939-63",
 author = "Victor R. Fuchs and Jean Alexander Wilburn",
 BookTitle = "Productivity Differences within the Service Sector",
 Publisher = "UMI",
 pages = "1-2",
 year = "1967",
 URL = "http://www.nber.org/chapters/c1430",
}
@book{NBERfuch67-2,
 title = "Productivity Differences within the Service Sector",
 author = "Victor R. Fuchs and Jean Alexander Wilburn",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "UMI",
 year = "1967",
 URL = "http://www.nber.org/books/fuch67-2",
}