Cita APA

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

Citación estilo Chicago

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

Cita MLA

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