APA aipamena

 Worcester, A. (2010).  Buiding skills for the Toefl iBT: Beginning.  Trẻ.

Chicago Style aipamena

 Worcester, Adam.  Buiding Skills for the Toefl IBT: Beginning.  Trẻ, 2010.

MLA aipamena

 Worcester, Adam.  Buiding Skills for the Toefl IBT: Beginning.  Trẻ, 2010.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.