@inbook{NBERc9527,
 Crossref = "NBERunkn39-1",
 title = "Income and the Measurement of the Relative Capacities of the States",
 author = "P. H. Wueller",
 BookTitle = "Studies in Income and Wealth, Volume 3",
 Publisher = "NBER",
 pages = "435-470",
 year = "1939",
 URL = "http://www.nber.org/chapters/c9527",
}
@book{NBERunkn39-1,
 title = "Studies in Income and Wealth, Volume 3",
 author = "nference on Research in National Income and Wealth",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1939",
 URL = "http://www.nber.org/books/unkn39-1",
}