@inbook{NBERc0971,
 Crossref = "NBERuniv55-1",
 title = "Characteristics and Types of Price Discrimination",
 author = "Fritz Machlup",
 BookTitle = "Business Concentration and Price Policy",
 Publisher = "Princeton University Press",
 pages = "397-440",
 year = "1955",
 URL = "http://www.nber.org/chapters/c0971",
}
@book{NBERuniv55-1,
 title = "Business Concentration and Price Policy",
 author = "George J. Stigler, Chairman, Universities-National Bureau Committee for Economic Research",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Princeton University Press",
 year = "1955",
 URL = "http://www.nber.org/books/univ55-1",
}