@inbook{NBERc0104,
 Crossref = "NBERborj06-1",
 title = "Ethnic Identification, Intermarriage, and Unmeasured Progress by Mexican Americans ",
 author = "Brian Duncan and Stephen J. Trejo",
 BookTitle = "Mexican Immigration to the United States",
 Publisher = "University of Chicago Press",
 pages = "229-268",
 year = "2007",
 month = "May",
 URL = "http://www.nber.org/chapters/c0104",
}
@book{NBERborj06-1,
 title = "Mexican Immigration to the United States",
 author = "George J. Borjas",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2007",
 URL = "http://www.nber.org/books/borj06-1",
}