Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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