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

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

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