APA-Zitierstil (7. Ausg.)

Berkley, S. (2004). Speak to influence: How to unlock the hidden power of your voice (Rev. 2nd ed.). Campbell Hall Press.

Chicago-Zitierstil (17. Ausg.)

Berkley, Susan. Speak to Influence: How to Unlock the Hidden Power of Your Voice. Rev. 2nd ed. Englewood Cliffs, N.J: Campbell Hall Press, 2004.

MLA-Zitierstil (9. Ausg.)

Berkley, Susan. Speak to Influence: How to Unlock the Hidden Power of Your Voice. Rev. 2nd ed. Campbell Hall Press, 2004.