APA (7th ed.) Citation

Ellis, M. (1984). Professional english: Communication skills for professionals working in business, industry and international organisations. Longman.

Chicago Style (17th ed.) Citation

Ellis, Mark. Professional English: Communication Skills for Professionals Working in Business, Industry and International Organisations. Harlow, England: Longman, 1984.

MLA (9th ed.) Citation

Ellis, Mark. Professional English: Communication Skills for Professionals Working in Business, Industry and International Organisations. Longman, 1984.