Citazione APA

Jan Bell. (1992). Integrated skills (upper intermediate): Workbook with answer key. London: Heineman.

Stile di citazione Chicago

Jan Bell. Integrated Skills (upper Intermediate): Workbook With Answer Key. London: Heineman, 1992.

Citazione MLA

Jan Bell. Integrated Skills (upper Intermediate): Workbook With Answer Key. London: Heineman, 1992.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.