Cita APA (7a ed.)

Low, O. (1979). A New Certificate of Proficiency English Course with Practice and Test Papers (3rd ed.). Arnold.

Cita Chicago Style (17a ed.)

Low, Ona. A New Certificate of Proficiency English Course with Practice and Test Papers. 3rd ed. London: Arnold, 1979.

Cita MLA (9a ed.)

Low, Ona. A New Certificate of Proficiency English Course with Practice and Test Papers. 3rd ed. Arnold, 1979.