Citazione Stile APA (7a Edizione)

Dummett, P., Hughes, J., & Stephenson, H. (2013). Life: Upper intermediate. Student book (1a. ed.). National Geographic.

Citazione stile Chigago Style (17a edizione)

Dummett, Paul, John Hughes, e Helen Stephenson. Life: Upper Intermediate. Student Book. 1a. ed. Hampshire: National Geographic, 2013.

Citatione MLA (9a ed.)

Dummett, Paul, et al. Life: Upper Intermediate. Student Book. 1a. ed. National Geographic, 2013.