Citazione Stile APA (7a Edizione)

Hill, D. A. (2013). Life: Pre-Intermediate. Teacher's Book (1a. ed.). National Geographic Learning.

Citazione stile Chigago Style (17a edizione)

Hill, David A. Life: Pre-Intermediate. Teacher's Book. 1a. ed. Hampshire: National Geographic Learning, 2013.

Citatione MLA (9a ed.)

Hill, David A. Life: Pre-Intermediate. Teacher's Book. 1a. ed. National Geographic Learning, 2013.