Gaya APA
Friedman, T, L. (2006).
The World is Flat : A Brief History of the Twenty-first Century .
Camberwel:
Penguin.
Gaya MLA
Friedman, Thomas, L..
"The World is Flat : A Brief History of the Twenty-first Century".
Camberwel:
Penguin,
2006.
Book - Paperback.