एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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