Cita APA (7th ed.)

Dummett, P., Stephenson, H., & Lansford, L. (2017). Keynote: Proficient. Student's Book (1a. ed.). National Geographic Learning.

Cita Chicago (17th ed.)

Dummett, Paul, Helen Stephenson, i Lewis Lansford. Keynote: Proficient. Student's Book. 1a. ed. Hampshire: National Geographic Learning, 2017.

Cita MLA (9th ed.)

Dummett, Paul, et al. Keynote: Proficient. Student's Book. 1a. ed. National Geographic Learning, 2017.