Cita APA (7th ed.)

Sayer, M., Dellar, H., & Walkley, A. (2017). Outcomes. Advanced: Teacher's book class audio. National Geographic Learning Cengage Learning.

Cita Chicago (17th ed.)

Sayer, Mike, Hugh Dellar, i Andrew Walkley. Outcomes. Advanced: Teacher's Book Class Audio. United Kingdom: National Geographic Learning Cengage Learning, 2017.

Cita MLA (9th ed.)

Sayer, Mike, et al. Outcomes. Advanced: Teacher's Book Class Audio. National Geographic Learning Cengage Learning, 2017.