APA引文

Froyen, R. T., & Greer, D. F. (1990). Principles of economics. Mac Millan publishing Company.

Chicago Edition Citation

Froyen, Richard T., and Douglas F. Greer. Principles of Economics. Newyork: Mac Millan publishing Company, 1990.

MLA引文

Froyen, Richard T., and Douglas F. Greer. Principles of Economics. Mac Millan publishing Company, 1990.

警告：这些引文格式不一定是100％准确.