Cita APA (7th ed.)

Dummet, P., Stephenson, H., & Lansford, L. (2016). Keynote: Intermediate. Student's Book (1a. ed.). National Geographic Learning.

Cita Chicago (17th ed.)

Dummet, Paul, Helen Stephenson, i Lewis Lansford. Keynote: Intermediate. Student's Book. 1a. ed. Hampshire: National Geographic Learning, 2016.

Cita MLA (9th ed.)

Dummet, Paul, et al. Keynote: Intermediate. Student's Book. 1a. ed. National Geographic Learning, 2016.