Cita APA (7th ed.)

Reader's Digest Association. (1993). Reader's Bigest how to write and speak better. Reader's Digest.

Cita Chicago (17th ed.)

Reader's Digest Association. Reader's Bigest How to Write and Speak Better. London: Reader's Digest, 1993.

Cita MLA (8th ed.)

Reader's Digest Association. Reader's Bigest How to Write and Speak Better. Reader's Digest, 1993.