APA aipamena

Robertson, D. (1972). Internation trade policy. London: Mamillan.

Chicago Style aipamena

Robertson, David. Internation Trade Policy. London: Mamillan, 1972.

MLA aipamena

Robertson, David. Internation Trade Policy. London: Mamillan, 1972.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.