Cita APA (7th ed.)

Doff A. Adrian & Jones C. Christopher. (1999). Language in use. Intermediate: Classroom Book. Cambridge, Cambridge University Press, 1999.

Cita Chicago (17th ed.)

Doff A. Adrian i Jones C. Christopher. Language in Use. Intermediate: Classroom Book. Cambridge, Cambridge University Press, 1999, 1999.

Cita MLA (9th ed.)

Doff A. Adrian i Jones C. Christopher. Language in Use. Intermediate: Classroom Book. Cambridge, Cambridge University Press, 1999, 1999.