Cita APA (7th ed.)

Dellar, H., & Walkley, A. (2010). Pre-intermediate outcomes: Class audio CDs. Heinle Cengage Learning.

Cita Chicago (17th ed.)

Dellar, Hugh, i Andrew Walkley. Pre-intermediate Outcomes: Class Audio CDs. Hampshire: Heinle Cengage Learning, 2010.

Cita MLA (9th ed.)

Dellar, Hugh, i Andrew Walkley. Pre-intermediate Outcomes: Class Audio CDs. Heinle Cengage Learning, 2010.