@inbook{NBERc1200,
 Crossref = "NBERfuch69-1",
 title = "What Is Output? PROBLEMS OF CONCEPT AND MEASUREMENT",
 author = "Arthur B. Treadway",
 BookTitle = "Production and Productivity in the Service Industries",
 Publisher = "UMI",
 pages = "53-94",
 year = "1969",
 URL = "http://www.nber.org/chapters/c1200",
}
@book{NBERfuch69-1,
 title = "Production and Productivity in the Service Industries",
 author = "Victor R. Fuchs",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "UMI",
 year = "1969",
 URL = "http://www.nber.org/books/fuch69-1",
}