Citazione Stile APA (7a Edizione)

Sayer, M. (2013). Life: Intermediate. Teacher's Book (1a. ed.). National Geographic Learning.

Citazione stile Chigago Style (17a edizione)

Sayer, Mike. Life: Intermediate. Teacher's Book. 1a. ed. Hampshire: National Geographic Learning, 2013.

Citatione MLA (9a ed.)

Sayer, Mike. Life: Intermediate. Teacher's Book. 1a. ed. National Geographic Learning, 2013.