Cita APA

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

Citación estilo Chicago

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

Cita MLA

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