@inbook{NBERc4124,
 Crossref = "NBERwolm38-1",
 title = "Hours of Work in American Industry",
 author = "Leo Wolman",
 BookTitle = "Hours of Work in American Industry",
 Publisher = "NBER",
 pages = "1-20",
 year = "1938",
 URL = "http://www.nber.org/chapters/c4124",
}
@book{NBERwolm38-1,
 title = "Hours of Work in American Industry",
 author = "Leo Wolman",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1938",
 URL = "http://www.nber.org/books/wolm38-1",
}