Friedman, T. L. (2006). The world is flat: A brief history of the twenty-first century (Updated and expanded.). Farrar, Strauss and Giroux.
Lua i Stíl Chicago (17ú heag.)Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century. Updated and expanded. New York: Farrar, Strauss and Giroux, 2006.
Lua MLA (9ú heag.)Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century. Updated and expanded. Farrar, Strauss and Giroux, 2006.
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