@inbook{NBERc12140,
 Crossref = "NBERfull10-1",
 title = "Monitoring and Enforcement of Climate Policy",
 author = "Hilary Sigman",
 BookTitle = "The Design and Implementation of US Climate Policy",
 Publisher = "University of Chicago Press",
 pages = "213-225",
 year = "2011",
 month = "August",
 URL = "http://www.nber.org/chapters/c12140",
}
@book{NBERfull10-1,
 title = "The Design and Implementation of US Climate Policy",
 author = "Don Fullerton and Catherine Wolfram",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2012",
 URL = "http://www.nber.org/books/full10-1",
}