Cita APA (7th ed.)
Hybels, S., & Weaver, R. L. . I. (1989). Communicating effectively (2nd ed.). McGraw-Hill.
Cita Chicago (17th ed.)
Hybels, Saundra, i Richard L II Weaver. Communicating Effectively. 2nd ed. NEw York: McGraw-Hill, 1989.
Cita MLA (9th ed.)
Hybels, Saundra, i Richard L II Weaver. Communicating Effectively. 2nd ed. McGraw-Hill, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.