Kravis, I. B. (1971). Price competitiveness in world trade / I. B. Kravis and Robert E. Lipsey. National Bureau of Economic Research.
Lua i Stíl Chicago (17ú heag.)Kravis, Irving B. Price Competitiveness in World Trade / I. B. Kravis and Robert E. Lipsey. New York: National Bureau of Economic Research, 1971.
Lua MLA (9ú heag.)Kravis, Irving B. Price Competitiveness in World Trade / I. B. Kravis and Robert E. Lipsey. National Bureau of Economic Research, 1971.
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