@inbook{NBERc0682,
 Crossref = "NBERmitc27-1",
 title = "The Contribution of Statistics",
 author = "Wesley Clair Mitchell",
 BookTitle = "Business Cycles: The Problem and Its Setting",
 Publisher = "NBER",
 pages = "189-360",
 year = "1927",
 URL = "http://www.nber.org/chapters/c0682",
}
@book{NBERmitc27-1,
 title = "Business Cycles: The Problem and Its Setting",
 author = "Wesley Clair Mitchell",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1927",
 URL = "http://www.nber.org/books/mitc27-1",
}