PUGEL, T. A. (2020). International economics. McGraw-Hill Education.
芝加哥风格引文PUGEL, Thomas A. International Economics. McGraw-Hill Education, 2020.
MLA引文PUGEL, Thomas A. International Economics. McGraw-Hill Education, 2020.
警告：这些引文格式不一定是100％准确.
APA引文