Katula, R. A. (1983). Comunication writing and speaking. Little, Brown.
Cita Chicago (17th ed.)Katula, Richard A. Comunication Writing and Speaking. Little, Brown, 1983.
Cita MLA (9th ed.)Katula, Richard A. Comunication Writing and Speaking. Little, Brown, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.