Cita APA (7a ed.)

Friedman, T. L. The world is flat: A brief history of the twenty-first century.

Cita Chicago Style (17a ed.)

Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century.

Cita MLA (8a ed.)

Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century.