APA (7th ed.) Citation

Alexander, L. G., & Close, R. A. (1991). Longman English grammar. Longman.

Chicago Style (17th ed.) Citation

Alexander, L. G., and R. A. Close. Longman English Grammar. London: Longman, 1991.

MLA (9th ed.) Citation

Alexander, L. G., and R. A. Close. Longman English Grammar. Longman, 1991.