@inbook{NBERc3776,
 Crossref = "NBERrugg75-1",
 title = "International Trade Prices and Price Proxies",
 author = "Irving B. Kravis and Robert E. Lipsey",
 BookTitle = "The Role of the Computer in Economic and Social Research in Latin America",
 Publisher = "NBER",
 pages = "253-268",
 year = "1975",
 URL = "http://www.nber.org/chapters/c3776",
}
@book{NBERrugg75-1,
 title = "The Role of the Computer in Economic and Social Research in Latin America",
 author = "Nancy D. Ruggles",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1975",
 URL = "http://www.nber.org/books/rugg75-1",
}