Cita APA (7a ed.)

Viney, P., Cawood, G., & Duckworth, M. Streamline english. Directions teacher's Editions (3a ed.).

Cita Chicago Style (17a ed.)

Viney, Peter, Graham Cawood, y Michael Duckworth. Streamline English. Directions Teacher's Editions. 3a ed.

Cita MLA (8a ed.)

Viney, Peter, et al. Streamline English. Directions Teacher's Editions. 3a ed.