HAYWARD STEVEN F. (2004). CHURCHILL ON LEADERSHIP. GRAMERCY PUB.
Lua i Stíl Chicago (17ú heag.)HAYWARD STEVEN F. CHURCHILL ON LEADERSHIP. NEW YORK: GRAMERCY PUB, 2004.
Lua MLA (9ú heag.)HAYWARD STEVEN F. CHURCHILL ON LEADERSHIP. GRAMERCY PUB, 2004.
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