APA引文

Krugman, P. R. (1995). Development, geography, and economic theory. Cambridge, Mass: MIT Press.

Trích dẫn kiểu Chicago

Krugman, Paul R. Development, Geography, and Economic Theory. Cambridge, Mass: MIT Press, 1995.

MLA引文

Krugman, Paul R. Development, Geography, and Economic Theory. Cambridge, Mass: MIT Press, 1995.

警告：這些引文格式不一定是100％准確.