Cita APA (7th ed.)
Friedman, T. L. (2005). The world is flat: A brief history of the twenty-first century. Farrar, Straus and Giroux.
Cita Chicago (17th ed.)
Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century. New York: Farrar, Straus and Giroux, 2005.
Cita MLA (9th ed.)
Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century. Farrar, Straus and Giroux, 2005.
Atenció: Aquestes cites poden no estar 100% correctes.