Hackman, M. Z., & Johnson, C. E. (2004). Leadership: A communication perspective (4th ed.). Waveland Press.
Lua i Stíl Chicago (17ú heag.)Hackman, Michael Z., agus Craig E. Johnson. Leadership: A Communication Perspective. 4th ed. Prospect Heights, Ill.: Waveland Press, 2004.
Lua MLA (9ú heag.)Hackman, Michael Z., agus Craig E. Johnson. Leadership: A Communication Perspective. 4th ed. Waveland Press, 2004.
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