APA (7th ed.) Citation

Friedman, T. L. (2006). The World is flat: The globalized world in the twenty-fist century (updated and expanded.). Penguin Books.

Chicago Style (17th ed.) Citation

Friedman, Thomas L. The World Is Flat: The Globalized World in the Twenty-fist Century. updated and expanded. 2006: Penguin Books, 2006.

MLA (9th ed.) Citation

Friedman, Thomas L. The World Is Flat: The Globalized World in the Twenty-fist Century. updated and expanded. Penguin Books, 2006.