@inbook{NBERc4405,
 Crossref = "NBERfrie57-1",
 title = "The Permanent Income Hypothesis",
 author = "Milton Friedman",
 BookTitle = "A Theory of the Consumption Function",
 Publisher = "Princeton University Press",
 pages = "20-37",
 year = "1957",
 URL = "http://www.nber.org/chapters/c4405",
}
@book{NBERfrie57-1,
 title = "A Theory of the Consumption Function",
 author = "Milton Friedman",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Princeton University Press",
 year = "1957",
 URL = "http://www.nber.org/books/frie57-1",
}