Fox, J., Willis, J., & Willis, D. (1996). Challenge and change in language teaching. Heinemann,.
Lua i Stíl Chicago (17ú heag.)Fox, Jeremy, Jane Willis, agus Dave Willis. Challenge and Change in Language Teaching. Oxford.: Heinemann,, 1996.
Lua MLA (8ú heag.)Fox, Jeremy, et al. Challenge and Change in Language Teaching. Heinemann,, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.