@inbook{NBERc7610,
 Crossref = "NBERfabr71-2",
 title = "Productivity in the Tertiary Sector",
 author = "Solomon Fabricant",
 BookTitle = "Supplement to NBER Report Ten: Productivity in the Tertiary Sector",
 Publisher = "NBER",
 year = "1972",
 month = "August",
 URL = "http://www.nber.org/chapters/c7610",
}
@book{NBERfabr71-2,
 title = "Supplement to NBER Report Ten: Productivity in the Tertiary Sector",
 author = "Solomon Fabricant",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1972",
 URL = "http://www.nber.org/books/fabr71-2",
}