APA (7th ed.) Citation

Ellis, M., O'Driscoll, N., & Pilbeam, A. (1984). Professional English. Longman.

Chicago Style (17th ed.) Citation

Ellis, Mark, Nina O'Driscoll, and Adrian Pilbeam. Professional English. Essex, England: Longman, 1984.

MLA (9th ed.) Citation

Ellis, Mark, et al. Professional English. Longman, 1984.