Cita APA

Doff, A., & Jones, C. (1999). Language in use: Beginner : self-study workbook with answer key. Cambridge: Cambridge U. P..

Citación estilo Chicago

Doff, Adrian, y Christopher Jones. Language in Use: Beginner : Self-study Workbook With Answer Key. Cambridge: Cambridge U. P., 1999.

Cita MLA

Doff, Adrian, y Christopher Jones. Language in Use: Beginner : Self-study Workbook With Answer Key. Cambridge: Cambridge U. P., 1999.