Barrett, D. J. (2013). Leadership communication 4th ed. MC GRAW HILL.
Lua i Stíl Chicago (17ú heag.)Barrett, Deborah J. Leadership Communication 4th Ed. MC GRAW HILL, 2013.
Lua MLA (8ú heag.)Barrett, Deborah J. Leadership Communication 4th Ed. MC GRAW HILL, 2013.
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