DuBrin A.J. (2015). Leadership: Reaearch Findings, Practice & Skills (8th.). Cengage Learning.
Lua i Stíl Chicago (17ú heag.)DuBrin A.J. Leadership: Reaearch Findings, Practice & Skills. 8th. USA: Cengage Learning, 2015.
Lua MLA (9ú heag.)DuBrin A.J. Leadership: Reaearch Findings, Practice & Skills. 8th. Cengage Learning, 2015.
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