Citazione Stile APA (7a Edizione)

Doff, A., & Jones, C. (1991). Language in use: Pre-intermediate course: teacher's book.

Citazione stile Chigago Style (17a edizione)

Doff, Adrian, e Christopher Jones. Language in Use: Pre-intermediate Course: Teacher's Book. Cambridge, 1991.

Citatione MLA (9a ed.)

Doff, Adrian, e Christopher Jones. Language in Use: Pre-intermediate Course: Teacher's Book. 1991.