GUELL, R. C. (2021). Issues in economics today. McGraw-Hill Education.
芝加哥风格引文GUELL, Robert C. Issues in Economics Today. McGraw-Hill Education, 2021.
MLA引文GUELL, Robert C. Issues in Economics Today. McGraw-Hill Education, 2021.
警告：这些引文格式不一定是100％准确.