Friedman, T. L. (2007). The world is flat: A brief history of the twenty-first century (first edition (2005).). Picador.
芝加哥风格引文Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century. first edition (2005). New York: Picador, 2007.
MLA引文Friedman, Thomas L. The World Is Flat: A Brief History of the Twenty-first Century. first edition (2005). Picador, 2007.
警告：这些引文格式不一定是100％准确.