@inbook{NBERc4444,
 Crossref = "NBERunkn41-1",
 title = "Business Cycles",
 author = "",
 BookTitle = "The National Bureau and its Collaborators",
 Publisher = "NBER",
 pages = "7-27",
 year = "1941",
 URL = "http://www.nber.org/chapters/c4444",
}
@book{NBERunkn41-1,
 title = "The National Bureau and its Collaborators",
 author = "NBER",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1941",
 URL = "http://www.nber.org/books/unkn41-1",
}