APA (7th ed.) Citation

Low, O. (1981). Certificate of proficiency English practice (1. publ., reprint.). Arnold.

Chicago Style (17th ed.) Citation

Low, Ona. Certificate of Proficiency English Practice. 1. publ., reprint. London: Arnold, 1981.

MLA (9th ed.) Citation

Low, Ona. Certificate of Proficiency English Practice. 1. publ., reprint. Arnold, 1981.

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