@inbook{NBERc4944,
 Crossref = "NBERcopp40-1",
 title = "Characteristics of Contracts and Purchasers",
 author = "Joseph D. Coppock",
 BookTitle = "Government Agencies of Consumer Instalment Credit",
 Publisher = "NBER",
 pages = "104-127",
 year = "1940",
 URL = "http://www.nber.org/chapters/c4944",
}
@book{NBERcopp40-1,
 title = "Government Agencies of Consumer Instalment Credit",
 author = "Joseph D. Coppock",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1940",
 URL = "http://www.nber.org/books/copp40-1",
}