APA (7th ed.) Citation

Biber, D., Johansson, S., & Leech, G. (1999). Longman grammar of spoken and written English. Longman.

Chicago Style (17th ed.) Citation

Biber, Douglas, Stig Johansson, and Geoffrey Leech. Longman Grammar of Spoken and Written English. New York: Longman, 1999.

MLA (8th ed.) Citation

Biber, Douglas, et al. Longman Grammar of Spoken and Written English. Longman, 1999.