@inbook{NBERc10819,
 Crossref = "NBERabra08-1",
 title = "Comment on "New Data for Answering Old Questions Regarding Employee Stock Options"",
 author = "Chris Riddell",
 BookTitle = "Labor in the New Economy",
 Publisher = "University of Chicago Press",
 pages = "180-184",
 year = "2010",
 month = "October",
 URL = "http://www.nber.org/chapters/c10819",
}
@book{NBERabra08-1,
 title = "Labor in the New Economy",
 author = "Katharine G. Abraham and James R. Spletzer and Michael Harper",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2010",
 URL = "http://www.nber.org/books/abra08-1",
}