APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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