APA引文

444605 Krugman, P. R. (1997). Development, geography, and economic theory. Cambridge : The MIT Press.

芝加哥风格引文

444605 Krugman, Paul R. Development, Geography, and Economic Theory. Cambridge : The MIT Press, 1997.

MLA引文

444605 Krugman, Paul R. Development, Geography, and Economic Theory. Cambridge : The MIT Press, 1997.

警告:这些引文格式不一定是100%准确.