Cita APA (7th ed.)

Clementson, T. (2005). Natural english. Oxford University Press.

Cita Chicago (17th ed.)

Clementson, Theresa. Natural English. Oxford: Oxford University Press, 2005.

Cita MLA (8th ed.)

Clementson, Theresa. Natural English. Oxford University Press, 2005.

Atenció: Aquestes cites poden no estar 100% correctes.