APA (7th ed.) Citation

Richards, J. C., Platt, J., & Platt, H. (1997). Longman dictionary of language teaching and applied linguistics. Longman.

Chicago Style (17th ed.) Citation

Richards, Jack C., John Platt, and Heidi Platt. Longman Dictionary of Language Teaching and Applied Linguistics. Essex: Longman, 1997.

MLA (9th ed.) Citation

Richards, Jack C., et al. Longman Dictionary of Language Teaching and Applied Linguistics. Longman, 1997.