Cita APA (7th ed.)

Hartley, B., & Viney, P. Streamline english. departures: Workbook a units 1-40 (23a ed.).

Cita Chicago (17th ed.)

Hartley, Bernard, i Peter Viney. Streamline English. Departures: Workbook a Units 1-40. 23a ed.

Cita MLA (8th ed.)

Hartley, Bernard, i Peter Viney. Streamline English. Departures: Workbook a Units 1-40. 23a ed.