Cita APA (7th ed.)
Doff, A., & Jones, C. (2004). Pre-intermediate language in use: Self-study workbook; with answer key. CUP.
Cita Chicago (17th ed.)
Doff, Adrian, i Christopher Jones. Pre-intermediate Language in Use: Self-study Workbook; with Answer Key. Cambridge: CUP, 2004.
Cita MLA (9th ed.)
Doff, Adrian, i Christopher Jones. Pre-intermediate Language in Use: Self-study Workbook; with Answer Key. CUP, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.