HARVARD BUSINESS REVIEW. (2001). HARVARD BUSINESS REV. ON WHAT MAKES A LEADERS. H B S.
Lua i Stíl Chicago (17ú heag.)HARVARD BUSINESS REVIEW. HARVARD BUSINESS REV. ON WHAT MAKES A LEADERS. BOSTON: H B S, 2001.
Lua MLA (9ú heag.)HARVARD BUSINESS REVIEW. HARVARD BUSINESS REV. ON WHAT MAKES A LEADERS. H B S, 2001.
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