Cita APA (7a ed.)

Friedman, T. L. (2006). The World is flat: The globalized world in the twenty-first century (Expanded ed.). Penguin Books.

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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