Cita APA (7th ed.)

Gairns R. Ruth & Redman S. Stuart. (2008). Oxford Word Skills. Basic. New York, Oxford University Press, 2008.

Cita Chicago (17th ed.)

Gairns R. Ruth i Redman S. Stuart. Oxford Word Skills. Basic. New York, Oxford University Press, 2008, 2008.

Cita MLA (9th ed.)

Gairns R. Ruth i Redman S. Stuart. Oxford Word Skills. Basic. New York, Oxford University Press, 2008, 2008.