APA aipamena

Firsten, R. (2004). Contemporary English: Workbook. New York, NY: McGraw-Hill ESL/EST.

Chicago Style aipamena

Firsten, Richard. Contemporary English: Workbook. New York, NY: McGraw-Hill ESL/EST, 2004.

MLA aipamena

Firsten, Richard. Contemporary English: Workbook. New York, NY: McGraw-Hill ESL/EST, 2004.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.