@inbook{NBERc4469,
 Crossref = "NBERmitc35-1",
 title = "The National Bureau's Measures of Cyclical Behavior",
 author = "Wesley Clair Mitchell and Arthur F. Burns",
 BookTitle = "The National Bureau's Measures of Cyclical Behavior",
 Publisher = "NBER",
 pages = "1-20",
 year = "1935",
 URL = "http://www.nber.org/chapters/c4469",
}
@book{NBERmitc35-1,
 title = "The National Bureau's Measures of Cyclical Behavior",
 author = "Wesley Clair Mitchell and Arthur F. Burns",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1935",
 URL = "http://www.nber.org/books/mitc35-1",
}