Frank, R. H. (2004). Principles of economics. McGraw-Hill.
Trích dẫn kiểu ChicagoFrank, Robert H. Principles of Economics. McGraw-Hill, 2004.
MLA引文Frank, Robert H. Principles of Economics. McGraw-Hill, 2004.
警告：这些引文格式不一定是100％准确.
APA引文