APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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