@inbook{NBERc7978,
 Crossref = "NBERglae08-1",
 title = "Estimating Agglomeration Economies with History, Geology, and Worker Effects",
 author = "Pierre-Philippe Combes and Gilles Duranton and Laurent Gobillon and Sébastien Roux",
 BookTitle = "Agglomeration Economics",
 Publisher = "University of Chicago Press",
 pages = "15-66",
 year = "2010",
 month = "February",
 URL = "http://www.nber.org/chapters/c7978",
}
@book{NBERglae08-1,
 title = "Agglomeration Economics",
 author = "Edward L. Glaeser",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2010",
 URL = "http://www.nber.org/books/glae08-1",
}