Ferrell, O. (2008). Business: A changing World (6th.).
Lua i Stíl Chicago (17ú heag.)Ferrell, O.C. Business: A Changing World. 6th. Ney York, 2008.
Lua MLA (9ú heag.)Ferrell, O.C. Business: A Changing World. 6th. 2008.
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