@inbook{NBERc3317,
 Crossref = "NBERstig70-1",
 title = "Indexes for Commodity Groups and for All Commodities Included",
 author = "George J. Stigler and James K. Kindahl",
 BookTitle = "The Behavior of Industiral Prices",
 Publisher = "UMI",
 pages = "71-87",
 year = "1970",
 URL = "http://www.nber.org/chapters/c3317",
}
@book{NBERstig70-1,
 title = "The Behavior of Industiral Prices",
 author = "George J. Stigler and James K. Kindahl",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "UMI",
 year = "1970",
 URL = "http://www.nber.org/books/stig70-1",
}