Cita APA (7th ed.)

(1979). Communication concepts and skills / Robert Hopper and Jack L. Whitehead, Jr.

Cita Chicago (17th ed.)

Communication Concepts and Skills / Robert Hopper and Jack L. Whitehead, Jr. 1979.

Cita MLA (9th ed.)

Communication Concepts and Skills / Robert Hopper and Jack L. Whitehead, Jr. 1979.

Atenció: Aquestes cites poden no estar 100% correctes.