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.
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