@inbook{NBERc3592,
 Crossref = "NBERauto07-1",
 title = "Helping Workers Online and Offline: Innovations in Union and Worker Organization Using the Internet",
 author = "Richard B. Freeman and M. Marit Rehavi",
 BookTitle = "Studies of Labor Market Intermediation ",
 Publisher = "University of Chicago Press",
 pages = "273-306",
 year = "2009",
 month = "November",
 URL = "http://www.nber.org/chapters/c3592",
}
@book{NBERauto07-1,
 title = "Studies of Labor Market Intermediation ",
 author = "David H. Autor",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2009",
 URL = "http://www.nber.org/books/auto07-1",
}