APA aipamena

Gershon, S., & Steven Gershon; Chris Mares. (2002). New english upgrade. Oxford: Macmillan Education.

Chicago Style aipamena

Gershon, Steven, và Steven Gershon; Chris Mares. New English Upgrade. Oxford: Macmillan Education, 2002.

MLA aipamena

Gershon, Steven, và Steven Gershon; Chris Mares. New English Upgrade. Oxford: Macmillan Education, 2002.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.