Cita APA (7th ed.)
Etherton, A. (2001). General certificate English (4th ed.). Nelson Thornes.
Cita Chicago (17th ed.)
Etherton, Alan. General Certificate English. 4th ed. Cheltenham: Nelson Thornes, 2001.
Cita MLA (9th ed.)
Etherton, Alan. General Certificate English. 4th ed. Nelson Thornes, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.