Cita APA (7a ed.)

Viney, P. Streamline english. Directions workbook B. Units 31-60 (3a ed.).

Cita Chicago Style (17a ed.)

Viney, Peter. Streamline English. Directions Workbook B. Units 31-60. 3a ed.

Cita MLA (8a ed.)

Viney, Peter. Streamline English. Directions Workbook B. Units 31-60. 3a ed.