Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (8a ed.)

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