Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

Dellar, Hugh, και Andrew Walkley. Outcomes: Intermediate Student's Book. second edition. United Kingdom: National Geographic Learning; Cengage Learning, 2016.

Παραπομπή σε μορφή MLA (9th εκδ.)

Dellar, Hugh, και Andrew Walkley. Outcomes: Intermediate Student's Book. second edition. National Geographic Learning; Cengage Learning, 2016.