APA (7th ed.) Citation

Low, O. (1979). Certificate of proficiency English practice. Arnold.

Chicago Style (17th ed.) Citation

Low, Ona. Certificate of Proficiency English Practice. London: Arnold, 1979.

MLA (9th ed.) Citation

Low, Ona. Certificate of Proficiency English Practice. Arnold, 1979.

Warning: These citations may not always be 100% accurate.