APA

Friedman Thomas L,, . (2006). The world is flat : The globalized world in the twenty-first century. New York: Penguin Books.

Chicago

Friedman Thomas L,, . 2006. The world is flat : The globalized world in the twenty-first century. New York: Penguin Books.

Harvard

Friedman Thomas L,, . (2006). The world is flat : The globalized world in the twenty-first century. New York: Penguin Books.

MLA

Friedman Thomas L,, . The world is flat : The globalized world in the twenty-first century. New York: Penguin Books. 2006.