Cita APA (7a ed.)

Gairns R. Ruth & Redman S. Stuart. (2011). Oxford Word Skills. Intermediate. New York, Oxford University Press, 2011.

Cita Chicago Style (17a ed.)

Gairns R. Ruth y Redman S. Stuart. Oxford Word Skills. Intermediate. New York, Oxford University Press, 2011, 2011.

Cita MLA (9a ed.)

Gairns R. Ruth y Redman S. Stuart. Oxford Word Skills. Intermediate. New York, Oxford University Press, 2011, 2011.