Cita APA (7th ed.)

Dellar, H., & Walkley, A. (2010). Outcomes Upper Intermediate. Heinle Cengage Learning.

Cita Chicago (17th ed.)

Dellar, Hugh, i Andrew Walkley. Outcomes Upper Intermediate. [Hampshire]: Heinle Cengage Learning, 2010.

Cita MLA (9th ed.)

Dellar, Hugh, i Andrew Walkley. Outcomes Upper Intermediate. Heinle Cengage Learning, 2010.