Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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