@inbook{NBERc0918,
 Crossref = "NBERfrie71-1",
 title = "The Missing Equation: The Third Approach Examined",
 author = "Milton Friedman",
 BookTitle = "A Theoretical Framework for Monetary Analysis",
 Publisher = "UMI",
 pages = "34-40",
 year = "1971",
 URL = "http://www.nber.org/chapters/c0918",
}
@book{NBERfrie71-1,
 title = "A Theoretical Framework for Monetary Analysis",
 author = "Milton Friedman",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "UMI",
 year = "1971",
 URL = "http://www.nber.org/books/frie71-1",
}