@inbook{NBERc4700,
 Crossref = "NBERcrea54-1",
 title = "Relation between Labor and Capital per Unit of Output and Capital per Man-hour",
 author = "Daniel Creamer and Martin Bernstein",
 BookTitle = "Capital and Output Trends in Manufacturing Industries, 1880-1948",
 Publisher = "NBER",
 pages = "70-75",
 year = "1954",
 URL = "http://www.nber.org/chapters/c4700",
}
@book{NBERcrea54-1,
 title = "Capital and Output Trends in Manufacturing Industries, 1880-1948",
 author = "Daniel Creamer and Martin Bernstein",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1954",
 URL = "http://www.nber.org/books/crea54-1",
}