@inbook{NBERc5662,
 Crossref = "NBERplum40-1",
 title = "Finance Charges",
 author = "Wilbur C. Plummer and Ralph A. Young",
 BookTitle = "Sales Finance Companies and Their Credit Practices",
 Publisher = "NBER",
 pages = "196-226",
 year = "1940",
 URL = "http://www.nber.org/chapters/c5662",
}
@book{NBERplum40-1,
 title = "Sales Finance Companies and Their Credit Practices",
 author = "Wilbur C. Plummer",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1940",
 URL = "http://www.nber.org/books/plum40-1",
}