APA (7th ed.) Citation

(1980). Proficiency English: A course for the Cambridge Proficiency examination (1. publ.). Nelson.

Chicago Style (17th ed.) Citation

Proficiency English: A Course for the Cambridge Proficiency Examination. 1. publ. Sunbury-on-Thames: Nelson, 1980.

MLA (9th ed.) Citation

Proficiency English: A Course for the Cambridge Proficiency Examination. 1. publ. Nelson, 1980.

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