@inbook{NBERc5803,
 Crossref = "NBERunkn39-3",
 title = "General Characteristics of the Petroleum Industry and Its Price Problems",
 author = "",
 BookTitle = "Price Research in the Steel and Petroleum Industries",
 Publisher = "NBER",
 pages = "82-94",
 year = "1939",
 URL = "http://www.nber.org/chapters/c5803",
}
@book{NBERunkn39-3,
 title = "Price Research in the Steel and Petroleum Industries",
 author = "Committee on Price Research",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1939",
 URL = "http://www.nber.org/books/unkn39-3",
}