APA (7th ed.) Zitazioa

Friedman, G. (2009). THE NEXT 100 YEARS: A FORECAST FOR THE 21ST CENTURY. Doubleday.

Chicago Style (17th ed.) Zitazioa

Friedman, George. THE NEXT 100 YEARS: A FORECAST FOR THE 21ST CENTURY. New York: Doubleday, 2009.

MLA (9th ed.) Zitazioa

Friedman, George. THE NEXT 100 YEARS: A FORECAST FOR THE 21ST CENTURY. Doubleday, 2009.