APA引文

Frank, R. H. (2007). Principles of economics. Boston: McGraw-Hill/Irwin.

Trích dẫn kiểu Chicago

Frank, Robert H. Principles of Economics. Boston: McGraw-Hill/Irwin, 2007.

MLA引文

Frank, Robert H. Principles of Economics. Boston: McGraw-Hill/Irwin, 2007.

警告：这些引文格式不一定是100％准确.