Cita APA (7th ed.)

Hartley, B., & Viney, P. Steamline english destinations workbook B Units 41-80 (7a ed.).

Cita Chicago (17th ed.)

Hartley, Bernard, i Peter Viney. Steamline English Destinations Workbook B Units 41-80. 7a ed.

Cita MLA (8th ed.)

Hartley, Bernard, i Peter Viney. Steamline English Destinations Workbook B Units 41-80. 7a ed.