Pugel, T. A. (2007). International economics (13th ed.). McGraw-Hill Irwin.
芝加哥风格引文Pugel, Thomas A. International Economics. 13th ed. Boston: McGraw-Hill Irwin, 2007.
MLA引文Pugel, Thomas A. International Economics. 13th ed. McGraw-Hill Irwin, 2007.
警告：这些引文格式不一定是100％准确.