Cita APA (7th ed.)

Barber, D., & Richardson, K. (2016). Keynote: Intermediate. Teacher's Book (1a. ed.). National Geographic Learning.

Cita Chicago (17th ed.)

Barber, Daniel, i Karen Richardson. Keynote: Intermediate. Teacher's Book. 1a. ed. Hampshire: National Geographic Learning, 2016.

Cita MLA (9th ed.)

Barber, Daniel, i Karen Richardson. Keynote: Intermediate. Teacher's Book. 1a. ed. National Geographic Learning, 2016.