APA (7th ed.) Citation

Reader's Digest Association. (1991). How to write and speak better. Reader's Digest Association.

Chicago Style (17th ed.) Citation

Reader's Digest Association. How to Write and Speak Better. London: Reader's Digest Association, 1991.

MLA (8th ed.) Citation

Reader's Digest Association. How to Write and Speak Better. Reader's Digest Association, 1991.