@inbook{NBERc5593,
 Crossref = "NBERunkn57-1",
 title = "Interview and Other Survey Techniques and the Study of Investment",
 author = "Robert Eisner",
 BookTitle = "Problems of Capital Formation: Concepts, Measurement, and Controlling Factors",
 Publisher = "NBER",
 pages = "513-601",
 year = "1957",
 URL = "http://www.nber.org/chapters/c5593",
}
@book{NBERunkn57-1,
 title = "Problems of Capital Formation: Concepts, Measurement, and Controlling Factors",
 author = "Conference on Research in Income and Wealth",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1957",
 URL = "http://www.nber.org/books/unkn57-1",
}