APA aipamena

Zeter, J., & Pederson, M. (2008). Sharpening skills for the TOEFL iBT. Tp. HCM: Trẻ.

Chicago Style aipamena

Zeter, Jeff., và Michael Pederson. Sharpening Skills for the TOEFL IBT. Tp. HCM: Trẻ, 2008.

MLA aipamena

Zeter, Jeff., và Michael Pederson. Sharpening Skills for the TOEFL IBT. Tp. HCM: Trẻ, 2008.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.