@inbook{NBERc7163,
 Crossref = "NBERushe80-1",
 title = "Introduction to "The Measurement of Capital"",
 author = "Dan Usher",
 BookTitle = "The Measurement of Capital",
 Publisher = "University of Chicago Press",
 pages = "1-22",
 year = "1980",
 URL = "http://www.nber.org/chapters/c7163",
}
@book{NBERushe80-1,
 title = "The Measurement of Capital",
 author = "Dan Usher",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1980",
 URL = "http://www.nber.org/books/ushe80-1",
}