APA (7th ed.) Zitazioa

Blackwell, A. (2006). Open forum 2: Academic listening and speaking. Univ. Pr.

Chicago Style (17th ed.) Zitazioa

Blackwell, Angela. Open Forum 2: Academic Listening and Speaking. Oxford: Univ. Pr, 2006.

MLA (9th ed.) Zitazioa

Blackwell, Angela. Open Forum 2: Academic Listening and Speaking. Univ. Pr, 2006.