APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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