APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.