Doff A. Adrian & Jones C. Christopher. (1999). Language in use. Intermediate: Classroom Book. Cambridge, Cambridge University Press, 1999.
Citazione stile Chigago Style (17a edizione)Doff A. Adrian e Jones C. Christopher. Language in Use. Intermediate: Classroom Book. Cambridge, Cambridge University Press, 1999, 1999.
Citatione MLA (9a ed.)Doff A. Adrian e Jones C. Christopher. Language in Use. Intermediate: Classroom Book. Cambridge, Cambridge University Press, 1999, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.