Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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