APA aipamena

Gershon, S. (2002). English upgrade: Workbook. Oxford: McMillan.

Chicago Style aipamena

Gershon, Steven. English Upgrade: Workbook. Oxford: McMillan, 2002.

MLA aipamena

Gershon, Steven. English Upgrade: Workbook. Oxford: McMillan, 2002.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.