APA引文

Harcourt,G C, & Karmel,P H. (1968). Economic activity. Cambridge University Press.

Chicago Edition Citation

Harcourt,G C, and Karmel,P H. Economic Activity. Cambridge: Cambridge University Press, 1968.

MLA引文

Harcourt,G C, and Karmel,P H. Economic Activity. Cambridge University Press, 1968.

警告：這些引文格式不一定是100％准確.