FERRELL, O. &. O. (2011). BUSINESS A CHANGING WORLD.
Lua i Stíl Chicago (17ú heag.)FERRELL, O.C & OTHERS. BUSINESS A CHANGING WORLD. DELHI, 2011.
Lua MLA (9ú heag.)FERRELL, O.C & OTHERS. BUSINESS A CHANGING WORLD. 2011.
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