APA (7th ed.) Citation

Sayer, M., Dellar, H., & Walkley, A. (2016). Outcomes : Pre-Intermediate: Teacher's book class audio (segunda edición.). National Geographic Learning.

Chicago Style (17th ed.) Citation

Sayer, Mike, Hugh Dellar, and Andrew Walkley. Outcomes : Pre-Intermediate: Teacher's Book Class Audio. segunda edición. Hampshire: National Geographic Learning, 2016.

MLA (9th ed.) Citation

Sayer, Mike, et al. Outcomes : Pre-Intermediate: Teacher's Book Class Audio. segunda edición. National Geographic Learning, 2016.