APA (7th ed.) Citation

Roberts, P. D. (1987). Plain English: A user's guide (1. publ.). Penguin Books.

Chicago Style (17th ed.) Citation

Roberts, Philip D. Plain English: A User's Guide. 1. publ. Harmondsworth: Penguin Books, 1987.

MLA (9th ed.) Citation

Roberts, Philip D. Plain English: A User's Guide. 1. publ. Penguin Books, 1987.