APA引文

Lipsey, R. G. (1971). An introduction to positive economics. ELBS.

Chicago Edition Citation

Lipsey, Richard G. An Introduction to Positive Economics. London: ELBS, 1971.

MLA引文

Lipsey, Richard G. An Introduction to Positive Economics. ELBS, 1971.

警告：這些引文格式不一定是100％准確.