Hybels, S. (1986). Communicating effectively. Random House.
Cita Chicago (17th ed.)Hybels, Saundra. Communicating Effectively. Random House, 1986.
Cita MLA (9th ed.)Hybels, Saundra. Communicating Effectively. Random House, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.