APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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