APA (7th ed.) Zitazioa
Sharpe, P. Barron's TOEFL IBT interint-based test 2009 (12th ed.). Galgotia Pub.
Chicago Style (17th ed.) Zitazioa
Sharpe, Pamela. Barron's TOEFL IBT Interint-based Test 2009. 12th ed. New Delhi: Galgotia Pub.
MLA (9th ed.) Zitazioa
Sharpe, Pamela. Barron's TOEFL IBT Interint-based Test 2009. 12th ed. Galgotia Pub.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.