Friedman, T. L. (2005). The world is flat: A brief history of the twenty-first century. Farrar, Straus and Giroux.

Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century. New York: Farrar, Straus and Giroux, 2005.

Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century. Farrar, Straus and Giroux, 2005.