REFERENCES
- Friedman , T. The World is Flat – A Brief History of the Twenty-First Century ; Farrar, Straus and Giroux : New York , 2005 .
- Friedman , T. Hot, Flat, and Crowded: Why We Need a Green Revolution – And How it Can Renew America ; Farrar, Straus and Giroux : New York , 2008 .