Style de citation APA (7e éd.)

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

Style de citation Chicago (17e éd.)

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

Style de citation MLA (9e éd.)

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