Richards, J. C., & Hull, J. P. (1996). Interchange: English for international communication: teacher's manual. 2.
Citazione stile Chigago Style (17a edizione)Richards, Jack C., e Jonathan Proctor Hull. Interchange: English for International Communication: Teacher's Manual. 2. Cambridge, 1996.
Citatione MLA (9a ed.)Richards, Jack C., e Jonathan Proctor Hull. Interchange: English for International Communication: Teacher's Manual. 2. 1996.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.