@inbook{NBERc6190,
 Crossref = "NBERfeen00-1",
 title = "Effort and Wages: A New Look at the Interindustry Wage Differentials  ",
 author = "Edward E. Leamer and Christopher F. Thornberg",
 BookTitle = "The Impact of International Trade on Wages",
 Publisher = "University of Chicago Press",
 pages = "37-84",
 year = "2000",
 month = "January",
 URL = "http://www.nber.org/chapters/c6190",
}
@book{NBERfeen00-1,
 title = "The Impact of International Trade on Wages",
 author = "Robert C. Feenstra",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "2000",
 URL = "http://www.nber.org/books/feen00-1",
}