Achua, C. F. (2010). Effective Leadership. South-Western Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Achua, Christopher F. Effective Leadership. South-Western Cengage Learning, 2010.
Lua MLA (8ú heag.)Achua, Christopher F. Effective Leadership. South-Western Cengage Learning, 2010.
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