APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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