Citazione Stile APA (7a Edizione)

Doff, A., & Jones, C. (1992). Language in use: A pre-intermediate course : self-study workbook A with answer key.

Citazione stile Chigago Style (17a edizione)

Doff, Adrian, e Christopher Jones. Language in Use: A Pre-intermediate Course : Self-study Workbook A with Answer Key. Cambridge, 1992.

Citatione MLA (9a ed.)

Doff, Adrian, e Christopher Jones. Language in Use: A Pre-intermediate Course : Self-study Workbook A with Answer Key. 1992.