Gaya APA

Friedman, T, L. (2007). The world Is Flat : A Brief History Of The Twenty-First Century (Ed 1). New York: Farrar, Straus and Girou.

Gaya MLA

Friedman, Thomas, L.. "The world Is Flat : A Brief History Of The Twenty-First Century". Ed 1 New York: Farrar, Straus and Girou, 2007. .