@inbook{NBERc1203,
 Crossref = "NBERfuch69-1",
 title = "The Growth of Sales Per Man-Hour in Retail Trade, 1929—1963",
 author = "David Schwartzman",
 BookTitle = "Production and Productivity in the Service Industries",
 Publisher = "UMI",
 pages = "201-236",
 year = "1969",
 URL = "http://www.nber.org/chapters/c1203",
}
@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",
}