Friedman, T. L. (2007). The world is flat: A brief history of the twenty-first century (first edition (2005).). Picador.
Chicago-viite (17. p.)Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century. first edition (2005). New York: Picador, 2007.
MLA-viite (8. p.)Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century. first edition (2005). Picador, 2007.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.