APA način citiranja

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

Čikaški stil citiranja

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

MLA način citiranja

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