APA (7th ed.) Citation

Kahn, J. E. (1991). How to write and speak better. The Reader's Digest.

Chicago Style (17th ed.) Citation

Kahn, John Elison. How to Write and Speak Better. London: The Reader's Digest, 1991.

MLA (9th ed.) Citation

Kahn, John Elison. How to Write and Speak Better. The Reader's Digest, 1991.