@inbook{NBERc5708,
 Crossref = "NBERunkn49-1",
 title = "International Comparison of Real National Income: A Note on Methods",
 author = "Hans Staehle",
 BookTitle = "Studies in Income and Wealth",
 Publisher = "NBER",
 pages = "221-272",
 year = "1949",
 URL = "http://www.nber.org/chapters/c5708",
}
@book{NBERunkn49-1,
 title = "Studies in Income and Wealth",
 author = "Martha Anderson",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1949",
 URL = "http://www.nber.org/books/unkn49-1",
}