Cita APA (7a ed.)

(2007). All clear: Listening and speaking (3rd ed.). Heinle CENGAGE Learning.

Cita Chicago Style (17a ed.)

All Clear: Listening and Speaking. 3rd ed. Boston: Heinle CENGAGE Learning, 2007.

Cita MLA (8a ed.)

All Clear: Listening and Speaking. 3rd ed. Heinle CENGAGE Learning, 2007.