Ferrell, O. C., & Hirt, G. A. (2003). Business: A changing world (4th ed.). McGraw-Hill/Irwin.
Lua i Stíl Chicago (17ú heag.)Ferrell, O. C., agus Geoffrey A. Hirt. Business: A Changing World. 4th ed. Boston: McGraw-Hill/Irwin, 2003.
Lua MLA (8ú heag.)Ferrell, O. C., agus Geoffrey A. Hirt. Business: A Changing World. 4th ed. McGraw-Hill/Irwin, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.