@inbook{NBERc2423,
 Crossref = "NBERkahn60-1",
 title = "Personal Interest Payments",
 author = "C. Harry Kahn",
 BookTitle = "Personal Deductions in the Federal Income Tax",
 Publisher = "Princeton University Press",
 pages = "109-125",
 year = "1960",
 URL = "http://www.nber.org/chapters/c2423",
}
@book{NBERkahn60-1,
 title = "Personal Deductions in the Federal Income Tax",
 author = "C. Harry Kahn",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Princeton University Press",
 year = "1960",
 URL = "http://www.nber.org/books/kahn60-1",
}