APA-Zitierstil (7. Ausg.)

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

Chicago-Zitierstil (17. Ausg.)

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

MLA-Zitierstil (9. Ausg.)

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