Cita APA (7th ed.)
(1993). How to write and speak better (ed.). The reader's digest association.
Cita Chicago (17th ed.)
How to Write and Speak Better. ed. Cape town: The reader's digest association, 1993.
Cita MLA (9th ed.)
How to Write and Speak Better. ed. The reader's digest association, 1993.
Atenció: Aquestes cites poden no estar 100% correctes.