APA (7th ed.) Citation

Friedman, G. (2009). The next 100 years: A forecast for the 21st century. Doubleday.

Chicago Style (17th ed.) Citation

Friedman, George. The Next 100 Years: A Forecast for the 21st Century. New York [etc.]: Doubleday, 2009.

MLA (9th ed.) Citation

Friedman, George. The Next 100 Years: A Forecast for the 21st Century. Doubleday, 2009.