Cita APA (7th ed.)

Koch, A. (1992). Speaking with a purpose (2nd ed.). Prentice Hall.

Cita Chicago (17th ed.)

Koch, Arthur. Speaking with a Purpose. 2nd ed. Englewood Cliffs, N.J: Prentice Hall, 1992.

Cita MLA (9th ed.)

Koch, Arthur. Speaking with a Purpose. 2nd ed. Prentice Hall, 1992.