@inbook{NBERc6625,
 Crossref = "NBERrugg74-1",
 title = "International Trade Prices and Price Proxies ",
 author = "Irving 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 = "1974",
 URL = "http://www.nber.org/chapters/c6625",
}
@book{NBERrugg74-1,
 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 = "1974",
 URL = "http://www.nber.org/books/rugg74-1",
}