Friedman, T. L. (2006). The World is flat: The globalized world in the twenty-fist century (updated and expanded.). Penguin Books.
Lua i Stíl Chicago (17ú heag.)Friedman, Thomas L. The World Is Flat: The Globalized World in the Twenty-fist Century. updated and expanded. 2006: Penguin Books, 2006.
Lua MLA (9ú heag.)Friedman, Thomas L. The World Is Flat: The Globalized World in the Twenty-fist Century. updated and expanded. Penguin Books, 2006.
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