Citazione Stile APA (7a Edizione)
Friedman, T. L. (2006). <The> World is flat: <the> globalized world in the twenty-first century (updated and expanded.). Penguin Books.
Citazione stile Chigago Style (17a edizione)
Friedman, Thomas L. <The> World Is Flat: <the> Globalized World in the Twenty-first Century. updated and expanded. London: Penguin Books, 2006.
Citatione MLA (9a ed.)
Friedman, Thomas L. <The> World Is Flat: <the> Globalized World in the Twenty-first Century. updated and expanded. Penguin Books, 2006.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.