Ferrell, O., Ferrell, L., & Hirt, G. A. (2009). Business: A changing world (7th ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Ferrell, O.C, Linda Ferrell, agus Geoffrey A. Hirt. Business: A Changing World. 7th ed. Boston: McGraw-Hill, 2009.
Lua MLA (9ú heag.)Ferrell, O.C, et al. Business: A Changing World. 7th ed. McGraw-Hill, 2009.
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