Cita APA (7th ed.)

Doff A. Adrian & Jones C. Christopher. (1991). Language in use. A PRE-Intermediate. New York, Cambridge University Press, 1991.

Cita Chicago (17th ed.)

Doff A. Adrian i Jones C. Christopher. Language in Use. A PRE-Intermediate. New York, Cambridge University Press, 1991, 1991.

Cita MLA (9th ed.)

Doff A. Adrian i Jones C. Christopher. Language in Use. A PRE-Intermediate. New York, Cambridge University Press, 1991, 1991.