APA aipamena

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

Chicago Style aipamena

Sayer, Mike, Hugh Dellar, and Andrew Walkley. Outcome: Intermediate Teacher's Book. United Kingdom: National Geographic Learning; Cengage Learning, 2016.

MLA aipamena

Sayer, Mike, et al. Outcome: Intermediate Teacher's Book. National Geographic Learning; Cengage Learning, 2016.