Cita APA

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

Chicago Style Citation

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

Cita MLA

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

Atenció: Aquestes cites poden no estar 100% correctes.