Friedman, G. (2009). THE NEXT 100 YEARS: A FORECAST FOR THE 21ST CENTURY. Doubleday.
芝加哥风格引文Friedman, George. THE NEXT 100 YEARS: A FORECAST FOR THE 21ST CENTURY. New York: Doubleday, 2009.
MLA引文Friedman, George. THE NEXT 100 YEARS: A FORECAST FOR THE 21ST CENTURY. Doubleday, 2009.
警告：这些引文格式不一定是100％准确.