@inbook{NBERc1158,
 Crossref = "NBERfuch68-1",
 title = "Productivity Differences Within the Service Sector: A Statistical Analysis",
 author = "Victor R. Fuchs",
 BookTitle = "The Service Economy",
 Publisher = "NBER",
 pages = "77-98",
 year = "1968",
 URL = "http://www.nber.org/chapters/c1158",
}
@book{NBERfuch68-1,
 title = "The Service Economy",
 author = "Victor R. Fuchs",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1968",
 URL = "http://www.nber.org/books/fuch68-1",
}