Citazione Stile APA (7a Edizione)

Doff, A., & Jones, C. (1997). Language in use: Upper-intermediate : classroom book (6th print.). Cambridge University Press.

Citazione stile Chigago Style (17a edizione)

Doff, Adrian, e Christopher Jones. Language in Use: Upper-intermediate : Classroom Book. 6th print. Cambridge: Cambridge University Press, 1997.

Citatione MLA (8a ed.)

Doff, Adrian, e Christopher Jones. Language in Use: Upper-intermediate : Classroom Book. 6th print. Cambridge University Press, 1997.