Ferrell, O., Ferrel, L., & Hirt, G. A. (2020). Business foundations a changing world 12th ed / OC Ferrell. Mc GrawHill.
Lua i Stíl Chicago (17ú heag.)Ferrell, O.C, Linda Ferrel, agus Geoffrey A. Hirt. Business Foundations a Changing World 12th Ed / OC Ferrell. Mc GrawHill, 2020.
Lua MLA (8ú heag.)Ferrell, O.C, et al. Business Foundations a Changing World 12th Ed / OC Ferrell. Mc GrawHill, 2020.
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