Cita APA (7a ed.)

Reader's Digest. (1991). How to write and speak better. The Reader's Digest Ass'n.

Cita Chicago Style (17a ed.)

Reader's Digest. How to Write and Speak Better. London: The Reader's Digest Ass'n, 1991.

Cita MLA (9a ed.)

Reader's Digest. How to Write and Speak Better. The Reader's Digest Ass'n, 1991.