Cita APA (7th ed.)
Verderber, R. F. (1991). Essentials of informative speaking. Wadsworth.
Cita Chicago (17th ed.)
Verderber, Rudolph F. Essentials of Informative Speaking. Califonia: Wadsworth, 1991.
Cita MLA (9th ed.)
Verderber, Rudolph F. Essentials of Informative Speaking. Wadsworth, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.