@inbook{NBERc1211,
 Crossref = "NBERgutt69-1",
 title = "The Yield Spread Between New and Seasoned Corporate Bonds, 1952—63. Joseph W. Conard and Mark W. Frankena",
 author = "Jack M. Guttentag and Phillip Cagan",
 BookTitle = "Essays on Interest Rates, Vol. 1",
 Publisher = "UMI",
 pages = "143-222",
 year = "1969",
 URL = "http://www.nber.org/chapters/c1211",
}
@book{NBERgutt69-1,
 title = "Essays on Interest Rates, Vol. 1",
 author = "Jack M. Guttentag and Phillip Cagan",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "UMI",
 year = "1969",
 URL = "http://www.nber.org/books/gutt69-1",
}