Greenfield, J. (2001). Challenges of leadership: C E O exchange. Films Media Group.
Lua i Stíl Chicago (17ú heag.)Greenfield, Jeff. Challenges of Leadership: C E O Exchange. Hamilton, NJ: Films Media Group, 2001.
Lua MLA (9ú heag.)Greenfield, Jeff. Challenges of Leadership: C E O Exchange. Films Media Group, 2001.
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