APA aipamena

Worcester, A., Bowerman, L., & Williamson, E. (2009). Building skills for the TOEFL iBT: Beginning. Tp. HCM: Trẻ.

Chicago Style aipamena

Worcester, Adam., Lark Bowerman, và Eric Williamson. Building Skills for the TOEFL IBT: Beginning. Tp. HCM: Trẻ, 2009.

MLA aipamena

Worcester, Adam., Lark Bowerman, và Eric Williamson. Building Skills for the TOEFL IBT: Beginning. Tp. HCM: Trẻ, 2009.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.