Cita APA (7th ed.)

Friedman, T. L. (2007). The world is flat: A brief history of the Twenty-first Century (1a. ed.). Picador.

Cita Chicago (17th ed.)

Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century. 1a. ed. Nueva York: Picador, 2007.

Cita MLA (9th ed.)

Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century. 1a. ed. Picador, 2007.