APA aipamena

Beaumont, J. (2006). Northstar: Building skills for the TOEFL iBT. New York: Longman.

Chicago Style aipamena

Beaumont, John. Northstar: Building Skills for the TOEFL IBT. New York: Longman, 2006.

MLA aipamena

Beaumont, John. Northstar: Building Skills for the TOEFL IBT. New York: Longman, 2006.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.