@inbook{NBERc1890,
 Crossref = "NBERlips63-1",
 title = "Characteristics of Basic Foreign Trade Data",
 author = "Robert E. Lipsey",
 BookTitle = "Price and Quantity Trends in the Foreign Trade of the United States",
 Publisher = "UMI",
 pages = "91-109",
 year = "1963",
 URL = "http://www.nber.org/chapters/c1890",
}
@book{NBERlips63-1,
 title = "Price and Quantity Trends in the Foreign Trade of the United States",
 author = "Robert E. Lipsey",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "UMI",
 year = "1963",
 URL = "http://www.nber.org/books/lips63-1",
}