Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

Stephenson, Helen, et al. Keynote: Upper Intermediate. Student's Book. 1a. ed. National Geographic Learning, 2016.