@inbook{NBERc2089,
 Crossref = "NBERcomm43-1",
 title = "The Nature of Costs and Prices: Introduction",
 author = "Committee on Price Determination",
 BookTitle = "Cost Behavior and Price Policy",
 Publisher = "NBER",
 pages = "3-11",
 year = "1943",
 URL = "http://www.nber.org/chapters/c2089",
}
@book{NBERcomm43-1,
 title = "Cost Behavior and Price Policy",
 author = "",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1943",
 URL = "http://www.nber.org/books/comm43-1",
}