APA (7th ed.) Citation

Richards, J., Platt, J., & Weber, H. (1990). Longman Dictionary of Applied Linguistics. Longman.

Chicago Style (17th ed.) Citation

Richards, Jack, John Platt, and Heidi Weber. Longman Dictionary of Applied Linguistics. Essex: Longman, 1990.

MLA (9th ed.) Citation

Richards, Jack, et al. Longman Dictionary of Applied Linguistics. Longman, 1990.