APA-viite (7. p.)

Dellar, H., & Walkley, A. (2016). Outcomes: Upper-Intermediate Student's Book. National Geographic Learning; Cengage Learning.

Chicago-viite (17. p.)

Dellar, Hugh, ja Andrew Walkley. Outcomes: Upper-Intermediate Student's Book. United Kingdom: National Geographic Learning; Cengage Learning, 2016.

MLA-viite (9. p.)

Dellar, Hugh, ja Andrew Walkley. Outcomes: Upper-Intermediate Student's Book. National Geographic Learning; Cengage Learning, 2016.