@inbook{NBERc7784,
 Crossref = "NBERfoss82-1",
 title = "Quality Adjustment in the Producer Price Indexes",
 author = "John F. Early and James H. Sinclair",
 BookTitle = "The U.S. National Income and Product Accounts: Selected Topics",
 Publisher = "University of Chicago Press",
 pages = "107-146",
 year = "1982",
 URL = "http://www.nber.org/chapters/c7784",
}
@book{NBERfoss82-1,
 title = "The U.S. National Income and Product Accounts: Selected Topics",
 author = "Murray F. Foss",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1982",
 URL = "http://www.nber.org/books/foss82-1",
}