BERGMANN H. (1999). EVERYONE A LEADER. JOHN WILEY AND SONS.
Lua i Stíl Chicago (17ú heag.)BERGMANN H. EVERYONE A LEADER. NEW YORK: JOHN WILEY AND SONS, 1999.
Lua MLA (9ú heag.)BERGMANN H. EVERYONE A LEADER. JOHN WILEY AND SONS, 1999.
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