Cita APA (7a ed.)

Dellar, H., & Walkley, A. (2016). Outcomes: Upper Intermediate Class DVD-ROM. National Geographic Learning Cengage Learning.

Cita Chicago Style (17a ed.)

Dellar, Hugh, y Andrew Walkley. Outcomes: Upper Intermediate Class DVD-ROM. United Kingdom: National Geographic Learning Cengage Learning, 2016.

Cita MLA (9a ed.)

Dellar, Hugh, y Andrew Walkley. Outcomes: Upper Intermediate Class DVD-ROM. National Geographic Learning Cengage Learning, 2016.