Pugel, T. A. (2004). International economics. Boston: McGraw-Hill/Irwin.
Trích dẫn kiểu ChicagoPugel, Thomas A. International Economics. Boston: McGraw-Hill/Irwin, 2004.
MLA引文Pugel, Thomas A. International Economics. Boston: McGraw-Hill/Irwin, 2004.
警告：这些引文格式不一定是100％准确.