APA aipamena

HARRD, R. International Economics/ R.f. Harrd. Cambridge Univ. Press.

Chicago Style aipamena

HARRD, R.F. International Economics/ R.f. Harrd. Cambridge Univ. Press.

MLA aipamena

HARRD, R.F. International Economics/ R.f. Harrd. Cambridge Univ. Press.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.