@inbook{NBERc4867,
 Crossref = "NBERking23-1",
 title = "The Volume of Employment",
 author = "Wilford Isbell King",
 BookTitle = "Employment Hours and Earnings in Prosperity and Depression, United States, 1920-1922",
 Publisher = "NBER",
 pages = "47-80",
 year = "1923",
 URL = "http://www.nber.org/chapters/c4867",
}
@book{NBERking23-1,
 title = "Employment Hours and Earnings in Prosperity and Depression, United States, 1920-1922",
 author = "Willford Isbell King",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1923",
 URL = "http://www.nber.org/books/king23-1",
}