APA (7th ed.) Citation

Devitiis, G. D., Mariani, L., & O'Malley, K. (1989). English grammar for communication exercises. Longman.

Chicago Style (17th ed.) Citation

Devitiis, G. De, L. Mariani, and K. O'Malley. English Grammar for Communication Exercises. Essex, England: Longman, 1989.

MLA (9th ed.) Citation

Devitiis, G. De, et al. English Grammar for Communication Exercises. Longman, 1989.